People can do whatever they want, but if I'm honest, I'd have to say that all the polyamorous people I've met have almost solely been immature college freshmen who are self-consciously trying to flout traditional sexual norms. I have yet to come across, either in real life or online, a mature and well-adjusted person who has identified as a poly; I have, however, encountered many obnoxious faux-libertines who are not nearly as revolutionary as they think they are.