I knew this question was going to be raised, had included it in my last post, but deleted it to save my comments when the question surfaced. Here's how I think.
Would I "let" my daughter go with a man like R. Kelly? If she is an adult and chooses to be with him, what option(s) do I have as her mother? "Kidnap" her and the minute I turn your back, she runs back to him? No, by the time my daughter reached the legal age of consent, my work in terms of "raising" her was done. I don't "own" her. If she at some point wanted to leave him and asked for my help, yes, I'd be there for her and wouldn't hesitate nor judge. Until then, I have to wait for that call.