I felt uncomfortable reading this in parts. It sounds/reads like you don't feel inspired or think you can make great photographs unless there is an almost romantic spark. Not finding the last model sexually attractive so being incapable of photographing her in an inspired way?

I wasn't aware judging women's bodies was part of the photographer's art:

"I was immediately turned off. She bordered on anorexically thin. My breasts were bigger than hers." - sorry but I find this offensive.

You paid these women to do a job, not be your ideal body or beauty type. Friends of mine have had very negative experiences with photographers crossing the professional line. I don't think it's respectful to say these women's bodies or reaction to you made your job harder. Obviously art requires connection and creative partnership, but the way you describe these women is more personal than professional.