You could try opening a general discussion about sex work with your friends to try to gauge their strength of feeling. I would do this one on one though because if someone very vocal starts moralising, others will probably just go along with it.
My sister knows I escort. We are very close and I knew she wouldn't be judgmental.
I don't have many close friends. My closest female friend, I know she would not approve and would probably be anxious for me, so I wouldn't ever tell her.
My closest male (gay) friend, I would tell him if I thought he could keep his mouth shut, but he can't, and we have a lot of mutual friends and ex colleagues, so I haven't said anything to him.