Sex and a trip to the gym have a few things in common They both get you hot. They both get you sweaty. And both get you breathing a little harder.

While it certainly can't replace your regular workout (bummer!), sex does have its fitness benefits. What a good thing to know just before Valentine's Day!

Fitness Magazine details 10 different positions and the strengthening perks of each. Missionary (if you put a little gusto into it) can be good for your core. Doggy style gives your quads and your glutes a workout. Check out their slideshow for more details. (Be warned, though. The illustrations may be mere outlines, but they're still probably not safe for work.) And don't forget to check out AOL Health for some tips on keeping the bedroom action alive and kicking.