I know it seems at the outset that, of course, their reproduction rates
*must* be less. But I challenge that assumption. From a historical
perspective, many, many, many individuals that are considered to have been
gay have also had children. (In fact this assumption is so strong, that an
individual's children is cited as evidence to counter the claim of his/her
homosexuality)

Even in ancient Athens where homosexuality (in men) was accepted more than
in any other ancient culture, it was more common that the men have wives and
children than not.