I'm going to go a different direction and argue that the RS232 has always been the most androgynous and third-sex of the connectors because:

• the female connector is most frequently the one that's a cable
• the male connector is most frequently directly connected to an appliance
• the male has the pin prongs, but is almost always recessed.
• the female connector has the the prong holes, but almost always juts out.

Who's connecting to who? Who's the top and who's the bottom? Who wears the pants? No one knows.