So I have this girl who I have a crush but I don't know if she's gay/bisexual/straight/etc..., how can test the waters (metaphorically) to find out? She mostly comes around in the summer time, by the way.
Does she know you're gay? If she doesn't, tell her, and it'll give her a perfect opportunity to tell you if she is gay/bisexual/whatever in response.
Mm I did that with one of my friends, she responded by telling me she is bisexual....to bad she is in a relationship.
Slightly more subtly, I guess you could ask her if she has a boyfriend, or girlfriend, or how her love life is going or whatever. That depends more on if you're close or not though I think.