I will almost always ask, but I try to find out during the session if she has a partner at home. If she does, usually I’ll pass on the oral just in case they had some fun in the morning or night before. Sometimes when you put a bit of effort at the beginning you get some in return without asking. Only a few times in 15 years have I found a lady who should have thought better then to agree without having been showered. Several have actually said “ I be ready for you next time” or “I’m not clean now, next time for sure”. I guess another thing that I have learned is that if I plan to visit a spa - I always phone ahead to see if they have showers available, and bring a bar of soap like I use at home!