I'm not obsessed with doing Greek at all. And I think most women don't want it. I think escorts and service providers offer it as an option just so they can create more business for themselves and make more money. That being said, there are a small percentage of women who enjoy it. Personally, I don't look for doing Greek, but if a woman enjoys it, and wants it, I'd be happy to oblige to her request. An anus is supposed to be used for an exit ramp, not an entrance, similar to highways and expressways. You can't use the same ramp for both entrances and exits.
A while back, I was having a relationship with a civilian woman, who was a few years older than I was. When we came around to having sex, I found out her pussy wall was so loose, that I couldn't feel anything. I couldn't believe it at the time. Seriously, I had to check to see if my cock was inside her. I tried going in deeper, but it still didn't work. I didn't say anything to her, as I didn't want to hurt her feelings. Needless to say, it wasn't very satisfying at all. I don't know why her pussy was so loose, as I never felt anything like that before, nor since. I don't know why her pussy felt that way, but it may be for different reasons. In this particular case, Greek sex may have been an option for men having sex with her. But, I didn't ask her, nor did I persue it. I hope this may have answered your question.