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It's got nothing to do with thinking you'd want sex. It has everything to do with you possibly being some kind of deviant, murderer, stalker, someone who may do harm kinda guy. At the very least,...

Now that you've elaborated... It would depend. Does she actually know who you are? That you live in her building or are you strickly going on her attempt at eye contact? If he was confident about...

You forgot creepy or inappropriate which it could be depending on: Why would you need to knock on their door? How well do you know them? Don't you have his/her telephone number?