I don't worry about it.

There probably be a lot of mixed responses about Greek, but for me it is just one of many pleasures one can indulge in, not only with certain Greek friendly providers but in the civvie world as well.  The entering sensation is distinctly different than the normal mode, however I think this is mainly a mental thing.  My first exposure to Greek was with a gf who guided me there while I was still half asleep and I did not realize where she had placed me until I reached around to touch where I thought I was located only discovered I wasn't!

Of the many visits, only one time did it come out a little darker. Many of the providers that provide greek are clean. Either way you should be covered. I wouldn't trust a provider that lets me have an uncovered greek experience. One the first visit at that.

It's entirely up to you, but you should know, your headed into a shitty situation..
Sorry, couldn't resist..
Really, its like everything else in the hobby, if your interested, try it..

Unless you are 8"+ you won't get a fudge cicle. Also if I know beforehand about a greek session I make sure to fast the night before and do the "duty" before my shower and he comes over.