It makes logistical sense to me -- if the ports have genders, then every docking has to be heteronormative. What happens if two ships just wanna cuddle? Or if you want to expand your space-station by docking it with another space-station?
(Gendered docking means you automatically fail the Space Bechdel Test, every time... for all humankind...)
This would be a post about USB connectors, except that's even worse.