here here :
It’s good that people only have two sexes. If there were more, there would be a PSC.

But if there were not two sexes in the world, male and female, but, for example, five! And in order to save mankind from extinction, it would be necessary to gather five. Well, and if the first got sick, the second was late, the third confused the password when appearing, and the fourth just changed his mind... It turns out that only the fifth is ready for love. But what can he do alone? How wonderful it is that there are only men and women. – Peter FM