It can be a flirty girl who kisses other girls passionately at a bar so that guys will look at her. It can be exposing her breasts for beads, photographers, drinks, etc.
"Girls Gone Wild"-type bottom feeders turned a weekend moment of wild abandon into "instant celebrity".
In a cultural realm where everyone young is trying to top everyone else, the threshold required to get noticed keeps moving.
Pierce your lips, your nipples, your genitals (and tell everyone). Flash strangers on your webcam. Brag about how young you were when you lost your virginity.
By the time they are in their 20s, they've "seen it, done it".