Overally sexual 15 year old. Should I take him to a child psychologist

I understand a lot of 15 year old boys lose their virginity or are extremely horny. But I am concerned over mine. I found out my son lost his virginity when he was 14 and has been having sex with different girls and cheating on some. From what I've found out he's been with at least 10 different girls and some in my house. If it was just that we would be having a talk but where I am wondering about a child psychologist is my sister called me when my son was spending the night with his cousins to tell me to come get him. She told me that she caught him exchanging nudes with someone he met alone. She told him she was going to have to tell me and that's when he offered to give her his body in exchange for not telling.... So he was going to prostitute himself to my sister and even said he would to her husband toO if she didn't tell. My sister said I need to take him to a child psychologist. He won't talk to me. I know it's normal for boys his age to have sexual feelings but this seems like he's overtly sexual to the point he's willing to almost prostitute himself to family.