A former friend told me last year that for her birthday she wanted an encounter with a woman. I sought out several premier ladies in the DFW area and inquired as to whether they might be my birthday gift to her. A few said they were "strictly dickly," but several said they would be happy to.
My ATF has told me lots about her girlfriend and doubles partner. I imagine they enjoy each other as much as or more so as any pleasure they may receive from a client. I'd love to find out someday. My ATF seems very bi and it is one of a long list of things I really like about her.
I have a sneaking suspicion that if you booked with a provider and asked if she would be up for finding another provider of her liking to join as well in pleasing her, many would jump at the chance.