This is an interesting thread.
Just like the rest of my personal and business life, I look at my hobby references the same as my credit and business references. It is my responsibility to make an easy path for my lender, supplier or provider to check me out.
I always give ample time for a new provider to check me out. P411 has been the best reference and I make sure that I have current okays. I also have a couple of ladies that I see regularly who, though they say they get a little jealous, do give references when asked. But, I do go back to them regularly!!!!
And I have reviews on a few different boards that are used in other parts of the country, which also helps.
There are two parts to this process. I know too many guys whose ego make this more difficult for the ladies.