Eh, depends on the context, and consent is a very important thing, regardless of gender. I know that if some girl had approached me at school and started doing this shit out of nowhere, I would have had a very negative response.
I was also someone with very low trust in people, and if a super pretty girl in class had done this to me, I would have been A, horny enough to die and B, "Why is she doing this there's no way she really like me-e-e-e!?!"