Me thinks they are fat and ugly first, then turn to carpet munching out of frustration.
The politically correct take would be that they get fat due to years of oppression, discrimination, harassment, poverty, misery, bullying, etc, etc.
Actually, not all lesbians are fat and ugly. I’ve known quite a few who are what I would call drop-dead gorgeous. Beautiful, thin, and quite nice. Who knows what causes them to choose that life style but it’s not for lack of potential male suitors.