>>5663718890% of eroge and otoge rape is the woman saying they don't want to be raped, happening to enjoy it and the man turns out to be the perfect partner who somehow knows exactly what she wants.
This is just a result of tons of women in real life feeling like they're not allowed to enjoy sex or feel ashamed of expressing sexual desire. I mean, you already have those old fart puritans telling girls they must preserve their chastity until marriage, so thinking about sex is bad. But now there's also the modern radical feminist movement which seems to push this idea that women are inherently less sexual than men, so wanting to have sex must be because they're a victim of patriarchy, instead of just normal hormones that they should be allowed to talk about.
Bodice ripper novels and non-con fiction are just that, a convenient "excuse" that the woman is enjoying sex because it's forced upon her. She doesn't have to "take responsibility" for any degenerate actions on her end because she said "no", so she isn't betraying society's expectations and still gets to indulge in her kinks.