For the record she was not fat when I hooked up with her.
I only hooked up with one fat chick back long ago in the days when i was single. Not gross fat, but fat compared to the petite little skinny chicks I was used to.
I was super duper broke and she bought me drinks all night. She spent a decent amount of money, I felt like she earned it and it was the right thing to do.i was a psychology major at that time and we had recently studied Povlov and conditioning, so I got the idea that since she was buying me drinks that was a positive behavior which should be rewarded, like giving a dog a treat for following a command or going outside to poop.

Thus I was engaging in community service for my fellow dudes by training this ho to buy dudes stuff to get what she wanted.