I don't know what you mean when you say high libido women don't experience arousal before starting sex. I am a high libido woman who thinks about sex A LOT. I'm in a monogamous relationship and have been for six years. I also have a vivid fantasy life as well, and masturbate daily (often more than once) and have done since I was a teen. In my perfect life, I would have sex multiple times a day with my partner. I also love reading erotic fanfiction as it gives me hands-free "womb clenches" that are orgasmic but purely mentally driven.
According to you, I don't exist. But I do. And if I am like this, other women must be too.