What card am I thinking of?

[sawyl]

Here's Greta Christina putting a Darwinian spin on why telepathy probably doesn't exist:

And, need I say, telepathy would confer a ridiculous advantage when it comes to reproduction. If you could know whether the person you're trying to mate with is interested or you're just wasting your time; if you could know what their turn-ons and turn-offs were and work your angle accordingly... you'd be in like Flynn. The ability to know what the opposite sex is thinking, or even to be slightly better at guessing than your competitors, would get your DNA replicated so fast it would make your head spin.

I believe this is what might be referred to as The Argument from What Women Want.