Seriously, either you have major insecurities or you have no sense of humility or morality whatsoever. I agree with the others, being an alpha male doesn't mean 'I've slept with more girls than you' etc etc. An alpha male is respected and in turn respects those around him. Not returning respect just makes you a prick, and you have to earn respect in the first place.
Manipulating people for sex? What a pleasant person you must be.
And you've met 6 people since this thread started? Good for you...that's six pieces of evidence to show you need to gain more morals. I'm wondering when she finds out if you'll even meet with her in person to apologise.
Look long and hard at yourself in the mirror, without telling yourself how good you think you look, and say to yourself why you feel the need to do this and why your girlfriend means so little to you. Because, like everyone else has said, she is going to get hurt and you don't sound like you have considered her once.