Depends what doubles you want, if you want double massage then that is easily done, double on part two is not necessary a good idea cos if you got two girls that is not comfortable with each other then they will not open up and you end up getting less. That is why I always suggest brothers against it. As for the current line up in 501, I an quite sure Sophie and Jackie will be a good pair for double. Apart from that can't think of any decent tac team right now.