Do I have a right to tell my friends not to sleep with my BIL?

My husband's brother is just annoying to me. He's a cocky manwhore who fucks anything with legs. He lives in Nevada so brothels are legal and he's constantly sleeping with women in brothels or hooking up with men on Grindr. People like him because he's funny and can sing but that's the only talent he has. I don't want my friends sleeping with him and he's already gotten 3 of them to sleep with him. It's weird. I know we are all adults and I can't tell grown people what to do with their body but there are 8 billion people in the world so why fuck someone who is technically my family and who annoys me. I've spoken to my husband about getting his brother to quit hitting on my friends and my husband said he can't control his brother. He spoke to him one time and all he did was jokingly ask him to stop trying to spread his syphilis. I don't know if he actually has any STD's my husband said he was just joking. I just don't understand why my friends can't go after anyone else.