You were talking to your GF actually

They are guest
You can't expect any less from guest

But still, what kind of mental deficiency do you have to be able to utter something so utterly creepy and perverted?

I'm pretty sure nearly everyone has uttered something pretty freaking perverted to a close friend or S/O at some point in their lives. Why? Because it can be REALLY funny.

Plus its true, if he dates her twin he would know.