Having started this thread some time ago I feel that I must now state my position.
I posted the thread to find out what others thought about the situation and did not in any way condone the arrangement. I am sure you are right, Kate. I would be very surprised if my wife was having paid sex with another man and even more surprised if my daughter was involved as well. I do NOT think the practice is acceptable and it certainly doesn't do anything for me at all.
On the other hand, those twins though..............