It's so much fun to watch actors' sexual chemistry in a movie. Sometimes their attraction feels REAL and sometimes that is because it is real. These are five sex scenes that were performed by real celebrity couples. Have all of these couples lasted? Of course not! It's Hollyweird, baby. BUT it is fascinating to see how their real chemistry affects their onscreen chemistry.

Let's take a look:

5. The Notebook

Rachel McAdams and Ryan Gosling were a very hot couple. They were on again and off again for years and they were sizzling hot in this 2004 romantic film that tells the story of two young people from opposite walks of life whose love endures for years. It is very obvious to me watching their sex scenes in the movie that these two were having a lot of off-camera sex.

5 Sex Scenes with Real Celeb Couples

You can't tell me that their chemistry wasn't 100% real. I feel like they were barely acting! Luckily, Rachel went topless even if the shots of her naked body aren't the best. It was thrilling to see her go naked nonetheless.

5 Sex Scenes with Real Celeb Couples

4. Cruel Intentions

Reese Witherspoon and Ryan Philippe were married for years, but you can go all the way back to the late 90s to watch the young blonds shine on camera. They have undeniable chemistry, even in this erotic thriller. There is only one sex scene with the two of them where Reese shows her rack. It's cruel of her not to show us more, but Ryan seems like he was the kind of boyfriend who may have been overprotective of his superstar girlfriend. Am I reading into that? I don't think so! I'd be protective of a hottie like this, too.

5 Sex Scenes with Real Celeb Couples

3. By the Sea

Brad Pitt has co-starred in a few movies with his current partners...and has made his co-star his partner. He and Angelina Jolie met and fell in love on the set of Mr. Mrs. Smith which was a super flirty and charged performance between the two of them, but there wasn't a sex scene in that raucous comedy. Cut to nearly a decade later when the married pair starred in an original film directed by Angelina called By the Sea.

5 Sex Scenes with Real Celeb Couples

If you compare the two movies, you can basically see the deterioration of their relationship. While this movie does have nudity, it's an incredibly tense relationship drama and a couple whose marriage is falling apart. At least we see Angie's boob!

2. Vanilla Sky

Do you remember that Tom Cruise dated Penelope Cruz? The Cruise-Cruz affair lasted almost three years which seems crazy now. It's a blip in all of our memories, but the couple put their relationship on display for Vanilla Sky. The weird part is that Penelope Cruz had previously starred in the original Spanish version of this film.

5 Sex Scenes with Real Celeb Couples

Was Tom so turned on by her previous nude scenes in the original movie that he wanted to recreate them with his new girlfriend? That could be. Who wouldn't want to act out movie fantasies with their celebrity girlfriend?

5 Sex Scenes with Real Celeb Couples

1. Ali

Finally, the couple that has been making ALL of the headlines for three nonstop days starred in a movie together and had a sex scene. Yes, Oscar winner Will Smith made sweet love to his wife Jada Pinkett Smith in 2001's Ali. Jada keeps her pink bra on, but this scene goes on for over two minutes. You can watch their real love here: