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I wonder whether we can distinguish between these two hypotheses:
I have the impression that until recently most cultures have either (1) regarded same-sex sex as abominable and shameful, or (2) regarded it as a perfectly normal activity for anyone (at least in certain circumstances). In case 1, a few percent of (what we would now call) homosexual people would be best advised to try to avoid being noticed. In case 2, they might be lost in the noise. In neither case is it clear that we'd expect to see much written about (what we would now call) actually homosexual people.
(I am vastly ignorant of history, and would not be very surprised to find that the impression reported in the previous paragraph is wrong.)
Eric Raymond has a fairly good description of historical attitudes towards homosexuality here.
Edit: here is the key paragraph:
... (read more)