I do the nod and am indeed male. Or at least i was the last time i checked. Half the shit i see on a daily basis has left me so jaded i wouldn't be surprised if the zombie outbreak started next week, let alone spontaneous gender change. Here...
...yep. Still male. My girlfriend doesn't do the nod. Not sure what the significance of the nod is, a vague acknowledgment of someones existence. Mind you my girlfriend doesn't even do a slight wave unless someone approaches her first, so maybe it's tied to the level of antisocialness you display. I'm very antisocial and nod slightly, if my girlfriend had her way people would've gone extinct decades ago and doesn't want to acknowledge other people, but in general men tend to be more antisocial than women, so maybe that's it. Who knows?