I consider the (stated or unstated) difference between GFE and PSE to be the option of anal sex.

Some (but not all) providers charge an additional amount for Greek service.

I have no interest in Greek service.  Thus, there would be no desire on my part to "upgrade" the specified services.

It is best to stick with providers who don't charge extra for greek. Sometimes will have a higher price but it cuts down on the pricing drama.

Next best thing is to see a provider who will list the charges separately for greek/anal.

Not all assholes in a women are created equal. Some are too tight for greek others are just right. I have been with some where my dick is just to fight to fit in there ass. Others I was amazed how easy it was to put in there ass (like a pussy). Some providers asses can squeeze your dick harder than their pussy. Others there pussy can squeeze harder than the ass.

Some people might not agree, but on the first date don't request greek. After you have the first date inquire about if PSE includes greek. PSE does not always include greek.

I was in a situation one time where a provider asked me to put my dick in her ass. I said ok, she held out her hand for an extra 100. I gave her the extra and had a good time. The next time I saw her I did not want greek. She asked for greek again and I told her (I don't have the extra), lol. Some women think greek is king and they can always get extra for it.

I have been in other situations where I have seen greek only providers. I did not realize that when scheduling the appointment. It did not matter because in that situation I wanted greek. I later found out they have an SO where they only give the pussy to the SO/Husband. I have only seen this with providers from PG county MD, no where else in the US from personal experience.

There is something about nutting with greek to completion and seeing the pussy squirt while fucking a women in the ass.

One provider told me "I don't understand why more wifes and girls won't take it up the ass, that is why so many guys hobby".