Girls lately have taken to fondling in public without sex. Well, without *full* sex. Just a little dip.
And the way to get things started is by wearing clothing that will attract the attention of a boy. Or another girl.
Many girl wear a top that gives them a bare midriff, which lets the boy slide his hand under and caress her boobs. The girl in this photo, however, has an even more accessible top. It's basically an open invitation to grope.
(Disclaimer: Not all girls who expose or nearly expose their breasts or their bottoms are hoping for a grope. If you ever come across one who says "no", then *back off immediately*!)