If I do make an appointment with him, I probably won't ask if it's nude or anything about release. His ad doesn't hint at anything like that because he A) doesn't offer that or B) doesn't want to advertise that.
If it's someone I think is hot and has no real red flags, then I go with just an expectation of massage by a hottie. Anything else is a nice surprise. Like most guys who look for a mix of mutual nudity and massage, I prefer to see it mentioned somewhere in the ad. Some masseurs don't mention it so I know there's a possibility he'll wear shorts and a t-shirt (or whatever he wears).
I try to be respectful in txts and emails and don't ask blatant or graphic questions. The words in someone's response, one word responses or no response tell me what I want to know about most: attitude and friendliness. Massage particulars and hotness won't matter if someone comes across unprofessional. I won't be the right client for them.