I can't speak for all the times it turns up as a theme, but often there's the element of "I don't want to admit that I like doing this because it's wrong, but really I do like it", which as a fantasy speaks to a lot of people who don't feel like they can admit to their own desires because of similar societal constraints. I don't mind it much as a theme myself, but it certainly can get tiresome even if you don't mind it - and, of course, I couldn't blame anyone for wanting to avoid it.
As for suggestions, I have these:
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Looking for the Perfect Fit (this is a nice funny one!)
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Dining Bar Akira
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Blue Morning (there's a certain amount of power balance issues in this one, just fyi, but it's really good)
And if you don't mind story collections, there's:
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Tableau numero 20
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Seduce Me After the Show
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I Want a Love Story