Yes. This is why I have little interest in 3somes, and more interest in single, beautiful, sex with a single woman.
Perhaps it's the 'hole-to-pole' ratio. In a three-some (I'm assuming 2 females to one male), you have at least 5 'holes' that need servicing. Now, unless you're using mechanical aid, there's only one 'pole' to service, and if it's a typical guy, that pole's going to be single-use at best. Thus, it's weird because each individual hole's chance of getting off is slightly less than what it would be for single male/female sex.
Thus, to make three-ways less weird, throw in some more toys for crying out loud!
-Damien
This thread has gotten boring. *yawn*