[boxed]

You lost it a bit at the end with women and men. Those aren't phylogenic groups, so not even closely related to the concept. It's a bit like saying "there's no such thing as granite" because not all granite is the product of two other pieces of granite having sex.

[voidUpdate]

I mean granite is just an arbitrary group we've made by saying that a rock that falls within certain percentages of quartz, feldspar, mica etc. Outside that, you get into the granitoids. The amounts are completely fluid and continuous, so the boundary is completely arbitrary. I guess in a way, there is no such thing as granite either