I'm pretty sure my son's girlfriend (15) is a lesbian. More than that I believe she has a crush on me (I'm in my mid 30s). She frequently "accidentally" walks in on me when I'm in the bathroom/taking a shower/changing clothes, and once when I was masturbating (with a vibrator, which I didn't have the thought processes to turn off so I know she heard it after I covered up.)

Whenever she visits (every few days) she insists on hugging me, and continues to hug me for longer than I feel comfortable with. When she does, she presses our breasts together firmly, and her hands are always down close to my ass, squeezing my lower back.

I've caught her (without confronting her) masturbating in my bedroom in my bed. Sometimes after she visits (and never when she doesn't) I'll notice my underwear drawer has been upset. She'll "Accidentally" touch my breasts (like with her elbow if she's sitting next to me.) She's always very eager to get into the changing rooms at the pool or beach when I take them there, and after we're there she takes as long as possible changing.

I could go on for a while about the things she's done to make me think this. I want advice though, on a couple of matters: First, she's convinced her parents to invite us (Me and my son, I'm not married) to a nudist resort for a week or so this next summer, should I accept this or would it be awkward? Second, what should I do about her in general?