Most Helpful Guy
The optimal threshold is +-4 inches.
But I honestly doubt a girl who's 5'11" would be willing to date me, lol. She'd be "too tall in comparison if she wears heels and wouldn't feel like a woman next to me" :(
Oh wait, that just means she's sexist and I've managed to weed out a sexist person just by being the height that I am. Woo! Go me!