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I highly doubt it since few people were having gay sex in the middle ages and especially not in rural areas to this day, and yet the % who are gay seems evenly distributed across the whole world. It's survived along with a sexual spectrum, because evolution has decided so. One theory out of the italian study is that mothers of gay kids tend to reproduce more overall, more than offsetting the likelihood that their gay kid(s) won't reproduce
How do you know the number of men that were having sex with other men in the middle ages? Anyway, if gay children never reproduce then only the carriers take the gene forward, which in time will result in the gene being eliminated.