Okay, I had it once with my ex-wife, but that was after I had licked her pvssy first, which I dreaded doing, but she kept pushing me to lick her pvssy. Again, some things look like fun in porn (ie when a guy is licking another girl's pvssy on screen) and can be arousing to look at, but when it comes to you to you to do that, it somehow becomes does not sound like fun anymore. We had oral before, but not to the point of trusting in, as I did that time.
As I had a terrible reaction with the last escort I visited back in December, 2014, I'm not in a hurry to get into any contact with an escort to try something like that out. I think that any woman that is completely comfortable with a total stranger thoating her has got to have some serious demons that she can pass on to other people (ie her demons could be enabling her or giving her the skills to do it). It's not a natural type of thing that is why most civvie (ie a euphamism of saying "normal" woman, in contrast to sex workers) women are not going to be into that. The vast majority of guys may not be sensitive to this or care (ie as they have their own demons, and they are in good company), but something like that would fracture my mind and send me into the looney-bin. I could never do that to a woman like that and maintain sanity afterwards.
Lots of things look good on the screen but are too gross or mind-fracturing when executed in real life.