When two people are in an LTR, it's usual for sex to be intense, passionate and frequent at the beginning, then over time the frequency and intensity dies down. Both partner's desire for sex with each other diminishes, but while men's is only a very gradual decline, women's desire for sex with their partner drops off a cliff. You only need to go to the deadbedrooms subreddit to see that it's overwhelmingly females who are causing this - either the men are complaining about their female partners, or the women are complaining that they are causing it and can't understand why.

Is it always inevitable that a woman ends up this way with a long term partner or husband? Or can this be prevented? The Red Pill doesn't really go into details as to how this can be prevented. They only suggest vague terms like "learn game" or don't get fat/begin working out (which is useless for anyone who is in shape already).