Is there any evidence that homosexuals were less likely to have children, less likely to marry prior to the modern age? Is there any evidence that they, in fact, had fewer children than heterosexuals?

This article, and others like it always seem to start from the assumption that homosexuals would have no children. Yet, it seems likely, that most did in fact get married and did have children. Perhaps at a lower rate, but perhaps not.

I doubt there is "historical" evidence, because as the paper's authors mention, there isn't a lot of good statistical data from the historical record on this sort of thing. Evidence from the past is "anecdotal".

However, one could study that question today. I was also wondering about that question; how many kids do gay men have on average?

Some gays are bisexual but weakly. They start off marrying- have kids and then realize they are more gay than straight and since people pair up more than tri-up, they settle on gay as their identity (even tho they are really bi).

I went to school with a gay guy that was married for 7 years, had two kids, and was completely comfortable with being gay now- felt he had always really been gay.