You don't think there's any reason for a woman to be embarrassed to admit (even anonymously) what features she finds attractive? Women face extreme scrutiny for their preferences, and they definitely feel that magnifying glass on them. They often don't want to be perceived as setting a high bar. Unless I'm misunderstanding what you're saying - I feel like I'm describing common knowledge.

It's like the where the guy has two options on the doctors form: heterosexual or homosexual and he writes in "straight"

Feminism finds masculinity/machismo threatening. Any woman that ascribes to being a feminist will say she doesn’t like masculinity so she doesn’t betray her cause, irrespective of how she feels.