It's not cheating if it's a threesome.

You consider a moment. "You won't cheat on your girlfriend, right?" He nods. "But it's not cheating if she joins us. Right?"

He gets a faraway look for the moment. You're sure he's imagining the scenario. A glance down confirms it -- he's got a raging boner. Looks like he's equipped to keep his girl satisfied... at least if he knows what to do with it.

"You're right, that wouldn't be cheating," he says. His shoulders slump and he shakes his head sadly. "But Carol would never go for it."

"You get the three of us alone and let me worry about what Carol will go for," you tell him.

You wish you were really as confident as you act.