i like the idea of a little more plot - it helps build the fantasy.

you could have an ad in the paper for guys who want to be pornstars. they could come down and have sex with an actual porn actor for the cameras. it could be a "real" reality site.

you could have a guy pick up guys at a dance club, take them somewhere, and fuck them.

we could have a main character who is a handyman that ends up fixing stuff in the apartments and then having sex with the residents. or how about a masseuse? plenty of room for adventures there. a football coach in college? private tutoring for failing students that leads to a more "hands on" teaching method?