Yeah some people don't realize that they were gonna get it anyway, irregardless of their Sexual Choices.
They don't know that their Great-Great Grandaddy was injected with Syphyllis and it mutated in his body over time. They don't know that their Great Grandaddy was injected with a "special" vaccine when he was born or that Grandma smashed some Dude (that didn't get her Pregnant) that a Grandaddy and a Dad who was just like that. So he passed her some
thick Semen that had those "mutations" that night. Fragments of its DNA hibernated in her body.
So when Grandaddy came along. He caught that and had your Father, he passed that Chromazone onto whatever Boys and Girls that came outta his nutsack into your mother's vagina.
And I guess theoretically the roles could be switched on either side. Your Great Grandaddy could be your could be your Great Grandma or a Great Uncle.
I mean, he coulda smashed Great Grandma behind Great Grandaddy's back.