I just want to chime in, as I read through this thread a while back, and being medium/large down there myself, I reached out to ask about the alleged size requirements. I didn't want to waste either of our time (or my money) if things weren't going to work.
The response was not super friendly, if I can say that. Basically "I don't know unless I see it" more or less. I even provided measurements (yep, I measured my dick lol!). The reply to that was pretty much "that means nothing to me". Not exact quotes. Just saying that the responses to my genuine questions about something that seemed to be important to her were not met with a proper response. This question was for her benefit, as well as mine.
It just seems to me that if something like this is an issue, then a ballpark response or some more info would be beneficial - to both sides. Is it length? Is it girth?
If there's something that could be a deterrent to providing these types of services offered, then a proper guideline should be offered, either in the ad, or during the inquiry itself. Keeps people from having to ask these questions in the first place (and in my case, not really get any type of response).