well, if you don't know whether the person is gay, it's probably a good idea to hang out in a neutral setting.... if you're open with your sexual orientation then definitely let that person know, but don't imply any intentions right off the bat.... if/when that person is comfortable enough with you that they can be open about their sexual orientation then they will, but don't press the issue as you can ultimately end up pushing that person away.... if they happen to be gay, then leave it at that and just continue being casual.... if you start hanging out more and you end up feeling a real connection to that person, then the two of you will probably just 'get together' naturally.... if not, then you'll either end up with a straight friend to hang out with, or a gay friend who you can hang out with and scope out other 'interesting' guys....