Some interesting reading for you. In the spirit of making working out more something we ALL want to do I thought I'd post this. This article was very obviously written by a woman for other women, but us guys can still take some idea's away from it... or just kill some time.
This was taken from (http://www.huffingtonpost.com/2013/12/09/burn-calories-with-sex_n_4414542.html)


Getting the maximum burn from your sexercise session takes dedication, excellent hand-eye coordination, and a little creativity, but it can be done.

Horizontal Zumba

Calorie Burning Sex Tip: Put a mix of hip hop, top 40 remixes, and Latin club jams on your iPod. Start getting down and dirty with your partner on the bottom. Ask him to keep still while you focus on fast, thrusting hip movements and switching positions every time the song changes. Say "Don't stop! Don't stop!" a lot, referring to both your desire for sexual pleasure and the need to keep your heart rate up to make your cardio count. Start with 20 minutes and work up from there. If you're not drenched in sweat and panting when you're done, you're not doing it right.

Muscle Groups Targeted: Cardio

The Just-The-Tip Plank Pose

Calorie Burning Sex Tip: Here's one way to make the staid old missionary position more fun and calorie-blasting: turn your time on top into a challenging plank pose. If you can hold for 60 seconds, reward yourself by lowering down onto your partner's d**k. Very slowly. Then repeat.

Muscle Groups Targeted: Core

The Thrusting Thighmaster

Calorie Burning Sex Tip: Basically, envision Suzanne Somer's old Thighmaster infomercials, but in this case you're naked and instead of a dubiously effective Home Shopping Network workout aid between your legs, it's a hot dude. Squeeze him until you can squeeze no more. That's usually about 45-50 reps.

Muscle Groups Targeted: Adductors

The Bridge To Pleasurebithia

Calorie Burning Sex Tip: Doing a bridge on your own is a challenging glute and hamstring workout. Doing it with a partner on top of you is even harder -- in his case, literally -- and more rewarding. If you can do two sets of 12, you've earned that climax, baby…and a post-sex snack.

Muscle Groups Targeted: Gluteus an hamstrings

Trapezius Squeez-ius

Calorie Burning Sex Tip: Who needs free weights and a balance ball when you have handcuffs, a bed, and a sweaty guy to balance on? Make like Houdini and try to set yourself free for three sets of 15 and you'll burn calories like magic.

Muscle Groups Targeted: Trapezius

Headboard Pull-Ups

Calorie Burning Sex Tip: Remember in high school P.E. when you couldn't do a pull-up in front of the whole class and it was totally humiliating? Time to avenge your adolescent workout failure with the help of your headboard and the promise of sculpted triceps and an intense orgasm. Use the headboard to help you pull-up on your partner for at least 30 reps.

Muscle Groups Targeted: Biceps, shoulders and lats