We really, really hope that this girl is joking, and that she is in fact single. We don't like to think of the idea that she really does have a boyfriend, and that he's got such appalling self-esteem that he's OK with his girlfriend going out to a nightclub wearing a t-shirt that invites strangers to kiss her while he's not looking. Unless, of course, he's into that kind of thing. We're not here to shame people for their niche interests!
As we'll see with many of the t-shirts on this list, this is a message that says a lot about the confidence of the wearer. She's comfortable with her looks and her sexuality, and she's probably also aware that there will be plenty of people nearby who want to take her up on the offer. We wonder if anybody ever tried to sue her for false advertising when she turned them down?