Superhero films have long straddled a strange line between being intended for a mass audience, including children, and appealing to people with heroes and villains wearing skintight outfits. As time has gone by and PG-13 has become the default rating for superhero films (with more and more R-Rated superhero films being released), there has been a bit more latitude. However, a lot of superhero films still tend to avoid any sort of real intimacy between their characters. Captain America has been kissed, like, four times in 70 years apparently.

RELATED: Guilty Pleasures: 15 Comics TOO HOT To Read In Public

Still, even with Marvel Studios' general downplaying of sex in their films, there have been plenty of hot moments in a lot of different superhero movies. Here are the 15 hottest scenes.

15 CLARK AND LOIS SHARE A BATHTUB

In Zack Snyder's two films featuring Superman so far, one of the key characters that has been used as a grounding force for Superman has been Amy Adams' Lois Lane. In Batman v Superman: Dawn of Justice, so much of the film is dark and foreboding, from innocents murdered to an epic battle between superheroes.

Therefore, it was important for Snyder to be able to interject some heartfelt humanity into the process, and one of the ways he did so was through a cute and sexy scene between Lois Lane and Clark Kent (Henry Cavill) early in the film, where Clark comes home to find Lois enjoying a bath and he joins her in the tub. Any time you have Amy Adams naked in a bathtub, you have yourself the makings of a sexy scene!

14 HARLEY QUINN CHANGES CLOTHES

The breakout performer from Suicide Squad was clearly Margot Robbie's portrayal of Harley Quinn, a performance so well regarded that she quickly was tapped to star in her own Harley Quinn-led spinoff of the film. Robbie is a fine actress, but in Suicide Squad, at least, a great deal of Harley Quinn's scenes revolved around her bum as she sexily walked around in super short hot pants.

One of the major scenes in the film comes soon after the criminals in the Squad are released and given access to their clothes and equipment before they are escorted by their military guards to the mission. As Eminem's "Without Me" plays, they all outfit themselves, but the camera is sure to slowly follow Harley Quinn as she changes in front of all the other criminals and soldiers, seemingly oblivious to how sexy she is looking while doing so.

13 HALLE BERRY AS CATWOMAN, GENERALLY

Far be it from us to defend the awful film that was 2004's Catwoman, starring Halle Berry (who you have to give credit for actually choosing to show up and accept her Razzie Award for Worst Actress for the film), but at the very least, the one thing that the film tried to do that it actually managed to achieve was to show off how attractive Halle Berry is.

In the film, she's a meek woman who discovers a conspiracy at her cosmetics company and is murdered, but revived as part of some magical Egyptian cat-type... thing? Meek no longer, she dresses up as a very scantily-clad superhero, the Catwoman! The whole time she's in the outfit is great, but there's a particularly great visual moment when she does a pointed walk down a catwalk (a la Right Said Fred).

12 HULKUS INTERRUPTUS

When we see Bruce Banner at the beginning of The Incredible Hulk (with Ed Norton now taking over the role from Eric Bana, who played the Jade Giant's alter ego in the first Hulk movie), Banner is doing everything he can to keep himself calm and zen, so he does not transform into the Hulk.

This is made difficult in a scene where Bruce and his former girlfriend, Betty Ross (played by Liv Tyler, who took over the role from Jennifer Connelly), have gone on the run together and are now staying at a motel. Betty cuts Bruce's hair to help with their fugitive routine and then they end up heavily making out and getting ready to have sex. The sexiness is cut short, however, when Bruce's heart rate monitor goes off and he has to stop, or else transform into that other guy.

11 BRUCE AND VICKI

So, this one is awkward and cute in equal measure. Kim Basinger had great chemistry with Michael Keaton in Batman, so you would think that when they got together as Vicki Vale and Bruce Wayne that it would be very sexy, but it ends up as just ever so slightly disturbing. First off, she drinks the whole night and he doesn't drink at all. So when they have sex, it is a bit strange, especially when he then seemingly blows her off in the morning (he's rocking the whole tortured soul deal).

Later, when he visits her and she tells him he treated her poorly, he throws her on the bed and tells her “Look, you’re a really nice girl and I like you a lot but for right now, shut up.” It's oddly played as a joke (as we know that he wants her to stop talking so he can tell her he's Batman).

10 BRUCE FALLS FOR THE WRONG WOMAN

One of the strangest things about Christopher Nolan's Dark Knight trilogy is how much Bruce Wayne (Christian Bale) seems to be in a state of arrested development, especially when it comes to women. He never actually gets together with his love interest of the first two films, Rachel Dawes (Katie Holmes in Batman Begins and Maggie Gyllenhaal in The Dark Knight). So really, for all that we know, by the time that The Dark Knight Rises comes out, the Nolan version of Bruce Wayne is still a virgin.

Naturally, then, the first woman that he has sex with in the Nolan film is Miranda Tate (they walk in the rain and then have sex on the floor), who turns out to be the villainous Talia Al Ghul. The first woman he sleeps with and she turns out to be a villain. Seems like a Batman sort of thing to do.

9 SLEEPING WITH WOLVERINE IS DEADLY

When it comes to who has the more torturous love life, Daredevil likely edges out Wolverine, but only because Daredevil has done it in much less time than Wolverine. That still doesn't mean that Wolverine doesn't have one depressing history with his love life. It seems like if you ever get together with Wolverine, you're basically signing your own death warrant.

That was the case with Kayla Silverfox (Lily Collins), who had a seemingly idyllic life with Wolverine (Hugh Jackman) in the woods in X-Men Origins: Wolverine, including a sexy love scene between the two. However, it turns out that she was an undercover operative tasked with keeping him placated until he could be used in the Weapon X project. Of course, she did actually love him, and helped he and other test subjects escape, but not before dying (the second time in the movie, as her death was faked earlier in the film).

8 MYSTIQUE MESSES WITH WOLVERINE'S HEAD

One of the odder characters in terms of sex appeal in the X-Men films has got to be Mystique. She's literally walking around naked all the time! And she was initially portrayed by a supermodel, Rebecca Romijn! Still, she was also blue and covered in scales, but it is still strange to have her walking around without clothes the whole time.

In any event, in X2, there is a scene where Mystique (who has temporarily joined forces with the X-Men at the time) tries to seduce Wolverine by shapeshifting into Jean Grey (Famke Janssen) and approaching Wolverine in his tent. He manages to pull her off, at which point she offers him a variety of options, including Storm (Halle Berry) and Rogue (Anna Paquin).

7 THE ONE GOOD THING IN DAREDEVIL

The 2003 Daredevil film was not good, but there were some good(ish) aspects to it, including Colin Farrell doing a respectable job as the villainous Bullseye. Probably the best part of the film, though, was the romance between Ben Affleck's Matt Murdock/Daredvil and Jennifer Garner's Elektra, who proved popular enough that she received her own ill-conceived spinoff film.

Garner and Affleck, who played Daredevil in the movie, first met when they filmed Pearl Harbor together, but it was after playing lovers in this film that they officially got together and married soon after. The chemistry in their sex scene together was electric (although Garner probably was a bit miscast as an assassin). Interestingly enough, though, their sex scene was actually cut from the Director's Cut of the film. As it turned out, the studio forced director Mark Steven Johnson to add a sex scene.

6 WOLVER-JEAN

One of the main subplots of the first three X-Men films is how much Wolverine is attracted to Jean Grey. As noted earlier, it was the impetus behind Mystique shapeshifting into Jean to seduce Wolverine in his tent. However, Jean remained with Cyclops (James Marsden) in the first two films, until she died at the end of X2. She returned in X-Men: The Last Stand, but she now had a split personality with the volatile Phoenix. She kills Cyclops early in the film.

She then visits the X-Mansion and seduces Wolverine, including using her telekinesis to take his belt off. Wolverine has a lot of superpowers, but his ability to resist Jean at this moment (as he knows something is wrong with her) is truly superhuman. His refusal of her advances set the Phoenix side of her personality take over again. Wolverine ultimately has to kill her in the film.

5 CATWOMAN IS PURR-FECT

Michael Keaton and Michelle Pfeiffer used to date during the 1980s, and it might have been that past relationship that kept Pfeiffer from being cast as Vicki Vale in the first Batman film. However, she did, indeed, get the role of Catwoman in the second Batman movie, Batman Returns. After the success of the first film, Tim Burton was given a lot more freedom for the second movie and his vision was a much darker, much more adult-themed film than the first.

As a result, Pfeiffer's Catwoman exuded sex appeal in her every scene, as she trotted around in a tight leather costume (one of those costumes so tight you know it must have been uncomfortable -- making her commitment to the role that much more impressive). There is a famously sexy scene where she has Batman pinned down and licks his face. Weird as it is, Pfeiffer and Keaton sell it beautifully.

4 LOIS LANE AND SUPERMAN

The 1970s was a strange time for films meant for an adult audience; there were only two realistic options, PG and R. As a result, the makers of Superman II had to keep a bit more towards the "general audiences" approach. As a result, when compared to some of these other movies, the famous romance between Lois Lane and Superman in Superman II is perhaps a bit too subdued to be considered "sexy," but we think that Margot Kidder and Christopher Reeve successfully bridge that gap and still make their scenes together hot.

Seeing Superman give up his powers just so that he could be with Lois Lane is still a powerful sequence. Kidder and Reeve had red-hot chemistry, even when a lot of it was done with subtle looks and not a lot of exposed skin.

3 SPIDER-KISS

In general, when it came to the romance between Peter Parker (Tobey Maguire) and Mary Jane Watson (Kirsten Dunst) in his Spider-Man trilogy, Sam Raimi tended to lean towards the old fashioned romance angle. He took a lot of inspiration from the Stan Lee and John Romita run on Amazing Spider-Man, and as a result, Peter and Mary Jane were mostly a chaste couple.

However, they had that one epic kiss! Mary Jane, with her rain-soaked shirt practically turned completely transparent, pulling down Spider-Man's mask after he saved her from some muggers, to give him a big passionate kiss. It was so hot that it became a piece of pop culture history right away -- one of those scenes that everyone knew about, whether they saw the film or not.

2 A YEAR OF SEX

One of the surprise hits of 2016 was Deadpool, starring Ryan Reynolds as the title character. The film was rated R, so they could go a lot further than most superhero films when it came to violence and, of course, sex. This was demonstrated in the sexy (while still hilarious) montage sequence early in the film where we see the courtship of Wade Wilson (Reynolds) and Vanessa Carlysle (‎Morena Baccarin) through a literal year's worth of sex between the two, as they have holiday-themed sex throughout the year.

The sequence also contains one of the most shocking jokes to ever hear in a superhero film, when they celebrate International Women's Day by having Vanessa actually "peg" Wade. That's a bold and hilarious joke to see in a superhero film. (PS: If you don't know what that word means, look it up on your own time!)

1 HALLELUJAH

In his 2009 adaptation of Alan Moore and Dave Gibbons' comic book masterpiece, Watchmen, Zack Snyder tried to stay as true to the original comic book as he could, almost literally translating a number of scenes directly from the page to the screen. However, when it came to the sex scene between Silk Spectre (Malin Ackerman) and Nite-Owl (Patrick Wilson), there is a bit of a difference between the comic and the movie.

Namely, in the movie, it's Patrick Wilson and not a doughy comic book character. In addition, you get to actually see the full scene, rather than snippets like in the comic. As a result, it's a shockingly explicit sex scene for a superhero movie that is likely far sexier than intended in the comic, but also very sexy in and of itself.

What do you think is the hottest scene you've seen in a superhero movie? Let us know in the comments section!