" The standard narrative of sexual desire is that it just appears-you're sitting at lunch or walking down the street, maybe you see a sexy person or think a sexy thought, and pow! you're saying to yourself, "I would like some sex!" This is how it works for maybe 75 percent of men and 15 percent of women...That's "spontaneous" desire. But some people find that they begin to want sex only after sexy things are happening. And that's normal. They don't have "low" desire, they don't suffer from any ailment, and they don't long to initiate but feel like they're not allowed to. Their bodies just need some more compelling reason than, "That's an attractive person right there," to want sex. They are sexually satisfied and in healthy relationships, which means that lack of spontaneous desire for sex is not, in itself, dysfunctional or problematic! Let me repeat: Responsive desire is normal and healthy. "

― Emily Nagoski , Come as You Are: The Surprising New Science that Will Transform Your Sex Life