Yoga: it strengthens the body, calms the mind, increases flexibility, and improves your sex life. No, seriously. We mean it!
Being inflexible can put a serious damper on any sex life (just think of all the positions you're missing out on!). If you haven't already, it's time to sign up for that yoga class at your gym, and get into fighting (fucking?) shape. Take some inspiration from this girl: she hasn't missed a class yet, and it's definitely paid off.