A selection from Saude & MacMillian’s Behaviors of the Gay Male textbook, page 49:
Here, we see a young teen slut that has won the attention of a slightly older male. He drew him in with loud moans as he humped a pillow on this sofa, then once the male sat, he quickly crawled onto his lap to continue rubbing against his thigh. This older one has accepted the proposition and has pushed down his underwear to place a hand on his ass. This sends a signal to any other men that might be around that this slut is his. He begins the sexual courtship by kissing. If the kissing style pleases the slut, then the slut will hint this by placing his partner’s hand over his penis and beg him to pet it. This one might be too young to offer his virginity yet, but bouts of play like this give boys an idea of who they will let breed them when they are ready.