The bone comment might actually be a reference to the baculum. The baculum is a bone that slides out of the crotch to get the penis stiff. Humans are one of the few species to NOT have a baculum, instead relying on pumping blood. Other modern day great apes, like gorillas, still have a baculum.
I think the girl(?) here is basically saying that she thinks the kid is like a gorilla, and that gets her hot.
On a side not, some Bible scholars contend that in Genesis when God took a rib from Adam to make Eve, that’s actually a mistranslation. They say that a better translation is the baculum, which would explain why humans don’t have one.