I would be inherently suspicious because through social programming, only the most fucking deranged or forceful women actually try to pick up a dude by being that forward, and I have fucked too many deranged and/or forceful women to actually be after that in a casual hookup
In fact, even if they were being dead serious about having a button collection, the fact that they'd be willing to admit that to a stranger they are obviously attracted to already sets off warning bells, I bet she likes to dress up like Keanu Reeves and act out the matrix trilogy in bed, I am not interested in that