The exact conversation in question went something like this:
Girlfriend mentions a party she went to where there were two genuinely gorgeous lesbians, which she found to be unusual.
Girlfriend got offended when I asked her to slow the story down and go into detail about what they were wearing/doing at the party. "Why is that hot?"
So I said its because 100% of the couple is hot, and I can agree with both. Then I said those girls were hotter than if they had each walked in with boyfriends. To which she said I was strange.