I think greeks are wonderful peoples ... Oh wait ...
Joke aside for me its more like a "taboo thing". Like its cool to say i did it more than the actual thing...
I mean i can say i did greek with the famous Sonia Von Sacher

Thats cool ! Now the act itself? I just remember telling Jasmine(the booker at the time) i would like to do it as it was not an extra at Unicorn so Sonia put my dick in her ass herself ... And it was kinda like "ohhh ok...coool". But to be honest i remember more the set up/how it happened than the actual "penetration feeling".
Even in porn i always wished Krystal Steal and Gina Lynn did greek cause they had the best asses in porn in the 2000s (and Krystal had that tattoo hummmmfff lol) but its more of a "that would had been kinkier" rather than ...i dunno... Anything else.
In other words i did greek i think like 4/5 times? Always was included. It was "cool" ... But the usual 100 upcharge ... Rarely would i had pay it.
There is maybe 3/4 more escorts i seen who comes to mind i wish i did because they became kinda "famous" and/or very good memories of mine.
But again in other words its more psychological than anything else.