I write sex scenes, which also have their share of mood and imagery, but are based in either the introduction or the resolution of conflict.
I haven't read your work, Selah, so I can only guess. But in my experience, most 'sex scenes' -- I mean whole scenes beginning in a sexual advance and ending in an orgasm, or a phone call or whatever -- aren't about sex at all, but power.
Which is not to say that the imagery is irrelevant -- sexual imagery can carry themes just as any other imagery can. It can reveal characters (which is part of what anchors a theme) and so on. But if you
had to, I bet you could write it with nary a lick of sexual imagery, and still produce exactly the same character insights, relationships and problems at the end.
I'm not saying that you should. I'm saying that the drama we associate with sex lies in the relationships, intrigues, the internal conflicts -- the social and psychological stuff. And that stuff exists with or without the sex -- which is why a seduction to murder say, can look so much like a sexual seduction at times.
So when we evaluate sexual imagery, I think we can't simply do so by saying 'it creates drama' -- I don't think it does. More likely it contributes to mood, to theme and may enhance the
underlying drama or compete with it. So that's how I think we need to evaluate it.
But several posters have said that it's not about the sex, and I agree. Several other genres are also strong mood genres -- fantasy, horror, and romance for example. None are known for their authors writing too
little imagery. When we have a criticism about their imagery, it's usually that authors are writing too damn
much. (If I had to pick a worst offender it'd be Fantasy by a country mile, but that's hardly the point.) So the same criteria that apply to descriptions of squelchy-bits apply equally to shiny swords, mutilated cadavers and Audrey Hepburn's hats.

My point being that a paragraph or so on any of these subjects without some intervening drama or some theme to enrich it, is normally plenty.
