Size?

A question for both genders. Don't know if this is the right place for it but here goes? The size of a mans penis, does it really matter in sex? I've talked to a lot of girls about this and some say it does and others say it doesn't. And another question, how big is too big? A lot of girls I've talked to say they don't like large size penises, is this true with a lot of ye women? And what is the average size of a man, responses from men for this question, with sizes please. I'm about 6 inches when erect, never had any trouble in the bedroom, just curious. Thanks in advance for responses