My first couple years in college, my friend and I started going to the gym between classes for something to do when we weren't studying. Then I transferred colleges and made friends with guys who went every day, religiously. I started learning more about what I could do to train my body and started getting even more interested.

I think being able to see the separate muscles in the body (such as the transition from biceps/triceps to the deltoids) is extremely sexy. And just like anyone else serious about bodybuilding, the burn and ache you feel the day after a really good workout is an amazing high :D