I hope I don't offend with this observation.
The incest theme is important, I think, if we really approach the novel from a psychological perspective and not as just a post-modern experiment. I think there is an important clue in Serge's consistent choice of sexual position. It is the same position in which he caught (or almost caught) his sister. (It is also relatively impersonal for the most intimate of acts.) I presume that his ability to make human connections was severed with his sister's suicide (not simply dying, but abandoning him.)
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