Enjoy masturbating to ugly women

I am attracted to pretty women. I like average realistic looking women as well. I'm not attracted to bigger women or ugly women. However, when I masturbate sometimes I am overcome with the desire to do so thinking of ugly women. The less likely I am to have sex with them the more I get turned on. There is obviously a point where they are too ugly. I don't think of them covered in excrement or with snaggly teeth or hairy faces. But ugly or somewhat disproportionately overweight women sometimes are what gets me off quickly. I think it might be a dominance thing. Is it normal?