Regardless of where people stand in their ethics, bottom line is that when two adults consent to do something people have to leave them alone. I do not support all that foreigners do in China, but after a certain age innocence is gone and responsibility for one's action starts.
Some people come on here condemning this and that, but one needs to stay out of people's choices.
I do not agree with some of your choices SB, but in the end they are your choices and not mine.