In my kids group, adolescents all, (8th-9th grade) there was one boy who sought out other boys for simulated homosexual sex. He would tug and pull at our jeans trying to do more than simulate. And later, as an adult he frequented the homosexual bars in SF. So I would say Yes, at adolescence he "knew" what he wanted to do and to whom.
In other situations we were playing "spin the botle" in the heterosexual sense. We were learning sex the tried and true way, in the dark while our parents thought us playing hide and seek.
Thanks for the clarification. I'm sorry to hear that. It sounds like a kid who was sexually molested.