natal females are almost certainly not going to get involved in sexual assault prevention for fetishistic reasons.

I don't think this is necessarily the case, particularly in the current era. At any rate, to make such an assumption across the board is definitely against safeguarding.

A lot of what was/is believed to be "known" about female sexuality is based on very limited research into specific, narrow generations and populations - and thus it might not apply to newer generations and all populations.

For example, American women of older generations like mine (Boomer) did not grow up watching porn videos, thinking penis-in-anus sex was normal/common heterosexual practice, or believing that it's customary or desirable for women to remove their pubic hair. But many younger people today seem to take take it for granted that "everyone" watches internet video porn, that all/most men want to put their dicks in women's asses - indeed, that many men prefer this over PIV - and that women "naturally" would want to remove all their pubes and that het men would find "bushes" or natural pubic hair on women to be unusual, off-putting, unattractive and even "gross."

Also, fetishism is not the only inappropriate, unseemly reason some women and men might be interested in this line of work. Some women might be groomers, procurers, partners of sex abusers or sex abusers themselves. Some might have sadistic or voyeuristic streaks, weird religious beliefs, a savior complex. Some might be drama junkies, ghouls who find other people's suffering exciting and so on. Lots of traumatized, damaged people go into the "helping professions" in hopes of working out their own issues, finding connection with others who share their problems, and/or because they want to "make lemonade out of lemons" and believe that having suffered abuse endows them with special abilities and a moral duty to prevent others from doing the same.

Yes, it's a documented truth that most sexual violence is committed by men. We know a fair bit about paraphilias in men because harmful sexual proclivities in males are often so pronounced that they are bleeding obvious, and because so many males just can't keep their sex fantasies to themselves - they have to express them in novels, art, cartoons, movies, TV, pornography, private online forums and now all over public social media platforms as well as in public and at work (hence the "take your whole self to work" movement). Moreover, male sex criminals and males with sex problems have been prime sources of research for sexologists, most of whom are male too.

Partly because the field of sexology, as well as all the arts and fields like porn and culture in general are dominated by men, I think a lot of commonly-held ideas about women's sexuality that are widely believed to be "true" are actually assumptions heavily informed and shaped by sexist stereotypes, aka gender.