These two activities could not be more different. Yoga, the exercise that I love to do alone. Its meditative qualities and stretchs that elongate the body and have really been the driving force in my maintaining a twelve stone weight loss some years ago. As I move between yoga poses, I am not sure that I am thinking at the time it is fun, yet after a session of yoga, I feel refreshed and happy. When I manage a particularly difficult pose, or push just a little harder for the stretch, I feel an achievement that is fun. Now sex ( its been a while more yoga has been done !) Is the activity and exercise that without a doubt burns more calories and encourages great hormonal balance and happiness. It should be fun ! Aside from a few awful car crash moments. Sex with the right person is the most fun and satisfying exercise. Until the man comes along, its yoga for me!