They get settled and very secure and stop putting out with zest because they lose competition anxiety and get very complacent. They just stop trying. No lingerie. No spontaneous BJs. No couples showers. They are always “too tired” or “have to get up early...”. Do NOT do it men. All risks, no rewards.
in my opinion, i think the problem isn't about the settled feminine, but the settled person whatsoever. the people (both feminine and masculine) that settled either with work or child thing or business as usual tend to not do as much as the initial stage because they're complacent and familiarity breeds boredom. the competition anxiety isn't there anymore.