Look at the bright side, if they tried to rape you, you could run over to the other side of the room and they'd have a heart attack trying to catch up...  In all seriousness though, this is incredibly creepy...  I used to know one of these types... he had a thing for a girl, the girl didn't shoot him down immediately, but told him she had no interest, he'd send the random dick pic, since apparently that's what Emily Post suggests, then one day he told her he slept with a hooker, but he was thinking of her all along, and that it's ok because he double bagged it (not seeming to understand how condoms work).  I don't know why, but she didn't swoon when she heard that... women are just weird, I guess... Some of these people are creepy beyond belief.