I am curious--and I am very much learning the novel form--why most of your comments rather dance around the sex issue. In between the lines seems to be . . ."do you absolutely have to have the sex?" And if you do, "less is more", or , sex is ok if the whole book has an erotic bent of some kind. What's wrong with a sex-chunk in an otherwise pretty sex-free novel? One from the past just leapt to mind--John Barth's The Sotweed Factor, a novel by no means erotic or prurient in its generality, has three or four sex scenes, one of which--I'd say close to 1000 words--seems downright pornographic. Hariki Mirikami's acclaimed The Wind-Up Bird Chronicles, again a non-erotic novel, has some very steamy scenes.
Sex is an integral part of life and if, esp in longer works involving complex character development, sex scenes contribute significantly to our sense of a character, I don't think an author should hesitate. As Olly points out, however, how MUCH will always be a problem.
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