A donor is not their kid, were talking about nature.
it has the dads DNA you moron, its his kid.
You seem to be trying now to change the goalposts regarding your point.
Adam, If you want to use him as being teh first man, could have been gay, he just had sex with eve to procreate the species.
Its a bit like straight bodybuilders sucking old mens cocks for cash, its not gay, they prefer women.