My stuff used to have lots of sex, but then I got really weird and started seeing my characters as more like people and didn't like intruding on their privacy LOL
but seriously, most of the stories I wrote that people liked the most seemed to have the least actual sex, and the most story. The one story I DID write that had NO sex though most people never even read lol so I dunno I think people tend to like a little bit. For myself I love a story that has people who love each other but is written with enough style that you never actually read about them "doing it" but have no impression of a lack of attachment between the characters. BUT lotsa people like sex so having a flavor of it, at least through some eroticism (i.e. touching/feeling caressing LMBO) is usually the best way to have more readers enjoy the piece.
I wrote a gay story for my college professor last semester while I was doing the parttime classes at U Florida and he actually digged it even though he's straight, but it was because there wasn't any jumping in bed AND he said it showed him a lot more about what it meant to be gay than anything else he's seen. I'll post it here sometime but I only have a written copy cause my computer caught on fire LMBO (long story) so all I have is the final copy so I hafta retype it sometime lol but yeah that's my story for the day!!