I'll see if I can add my little two cents. I don't think sex in fiction is a bad thing like others have said it can be used to move a story along, show the emotions of the characters, and add to the plot if that is what the story is about. I've read some stories where the characters have sex after meeting each other maybe three pages ago and I'm like "Alright XD" I know I like some build up to things like playing or snarking at each other. That way when the characters jump each other you know it's going to happen. I try to do that when I write even if my muse is yelling "Put them together now!" I always go "Hmm, not yet they do need to know each other" lol

I hope that makes some sense. XD