split the donation to bring the cost down for each of you, you can forget about that.  You're each going to pay the full hourly rate, the same as a FMF threesome where both girls get the full hourly rate.  On the other hand, if you are more comfortable having a wingman when you see a lady, and are willing to pay the freight, I don't see anything wrong with it.  For me, when it comes to sex, I want to have the only dick in the room, but there can be multiple ladies at my discretion.  

Try posting this on the New York, Phiadelphia and DC boards.

She advertises taking up to three or four guys at the same time. She’s a total nympho.

I've done that

Strictly MFM.. no male to male contact.  A guy asked about it. I was game & set it up with my ATF at the time. It was super hot.. loved it.  
My only criticism is very minor. I was helping my ATF out of her super tight jeans.. turned around & the guy stuck his cock in her face. A little too fast for me. I had been looking forward to getting her turned on  & some foreplay. He went right for it & came really quickly the 1st round. She gave me a BBBJ  while he was doing her doggie.. we were still om the couch. I had envisioned a lot of play before moving into it.. each to their own I guess.  That's my point. If I did it again, I would want to have a very specific discussion with the other guy.. live & learn.. all in all it was still a blast.  We each paid the 90 minute rate set by the provider. She doubled he money & hopefully enjoyed herself.. her clit was standing up really high, so I expect that she did. Before you get any ideas.. I'm no.longer on touch with her..

DP and all
Gotta be experienced tho