This better be a toggle you have to turn on... I don't want my female companions constantly hitting on me. Even Kaliyo makes me uncomfortable right now. With as bad as the haircuts are in this game, you'd think you'd just be able to make a male look female and a female look male and call it a day lol.
Again I'm pretty sure none of the companions do anything like that. You probably have to start it all.
Unless they make some more... flamboyant companions later on.