Emotional beer goggles 

The tendency for a person to become more or less attractive depending on their personality. It's more common for women to experience this.

M: Why'd you hook up with Craig, I thought you said he looked like a baboon's arse?
L: Well he's really funny and cool, and he's not actually that bad looking after all.
M: Sounds to me like you've got your emotional beer goggles on.

S: Don't hook up with that guy! He's disgusting!
E: Why not? He's not bad looking?
S: Yes, he's totally gross! Once you get to know him you'll know what I mean.
E: I don't have time for your emotional beer goggles, he's hot and I'm going in.

Emotional beer goggles by SparklyCupcake June 22, 2012