You're missing out on a lot then.
Three way make out session, double BJ with one on the left side and one on the right side, being rimmed and BJ at the same time, stacking the girls on top of each other then alternating holes in a missionary position, then doing the same thing in a doggy position, etc. Etc.
If the girls are into each other then it is definitely worth more than the single rate x2.
[QUOTE=NintyNine;5871426]For double the price, I'd rather book each duo girl separately for 2 hours than have both together for 1 hour.
There should be a discount for doubles.[/QUOTE]