This has happened to me twice on the same week. First I was talking with a friend that I havent seen in a while, not really my friend though and he was constantly arguing with his GF. Suddenly she approaches me showing all the IOIs, rubbing my arm, looking at my lips, asking me to dance. How should I react in this scenario?

The other case was similar but with a couple of lesbians where one was teasing me and I just couldnt tell if they were shittest or lesbo-tease since I wasnt aware of her sexual orientation (lesbian or bi). All of these occured with their SO relatively close or inside the locale.