I'm surprised no one's mentioned the pick up community, AKA gaming (as in "The Game"). It's a good way for hetero guys to meet other hetero guys. A lot of people who stick with it are the type who want to better themselves in some way, which is quite inspiring. Plus, you'll learn skills to meet loads of girls as well, and it's up to you whether you choose to put in the time to have them as friends.

I know a lot of people who it's helped, and I've made some good friends through it as well. The social skills can also be translated to business/events so even if you're not interested in a stream of conquests, it can be valuable. It's the one thing I wish I'd found when I was at university.