According to their user agreement they do not allow these sites to receive and send funds from coinbase. They do not deny these workers to open account on coinbase but they prohibit them for the use on such sites where sex workers work. So they will not freeze/lock your account unless they find that any fund is received or sent to any of the adult website.
Oh wow, Coinbase is new for me and it disappoints me. It's very hard with normal banks, I know that. But also Coinbase... why am I surprised? I just didn't think about the insanity within crypto, it's because of the exchange and there rules. We must accept it. I would be happy if the negative view about the adult industry finally stopped. Believe me, there are a lot of sex workers who want to do the job.