What I'm saying is, from a biological perspective, isn't sex determined by the gametes (which as far as I known, are two), regardless of vestigial organs, number of chromosomes, etc.? I think that's what caused the confusion on the parent about existing more than one sex (reproductive role); of course, by that measure, infertility is undetermined as it plays no role in reproduction.
Totally agree with you. At least in humans, there are two very clearly defined reproductive roles. Test tubes and surgical procedures can interfere a bit, but you can't be "mostly" a gamete donor or "only somewhat" of a gamete receptor.
