"Yes. We have agreed that we will allow each other to have sex with Tom. Tom is only permitted to have sex with people we have all agreed to join the group. We have all proved we are disease free, and have committed to only have sex with Tom, and if we do anything sexual with anyone but Tom, or the other girls in the group, we leave the group. This includes prior activity, so only virgins are being considered. We have found no reason to make exceptions." Sarah explained.

Brittany was looking from me to the girls and back to me.

"How long has this been a thing....?" She...