My son and his girlfriend are both professional dancers. My son is popular on tiktok. They post a lot of choreography. I saw one of their recent videos, it wasn't on tiktok but instagram. They were dancing. His girlfriend twerks on him and he kind of grinds back. I didn't say anything to him but it did upset me. He is 17 and she is 18. This isn't the first time I've discovered them being sexual. He bought condoms back in December. I don't know, I'm worried he's growing up too fast. I didn't know he had this kind of side and I'm just not happy.