I’m (m 20s) asexual, how do I sus out which girls actually just want to fuck me when I say I want to cuddle.

I’m sex neutral I think. I’m heteroromantic, or maybe demiromantic I think. I’m only into girls romantically but the connection takes a long time to build. I think I could have sex with a girl I really trusted, doesn’t necicariky have to be at a point of love, but it’s purely for the physical sensation of pleasure on my penis. I’m not aroused by people, and this makes it hard when I actually do have sex to be unselfish. It’s usually never worth it to reciprocate the same amount it take sher to cum, because girls take so long. But my question is how do I sus out who just want me to fuck them when I want to cuddle, because some girls say their down but then when we snuggling they get horny and want me to eat them out and shit even though I’m not Into it.