If by “a long period of intimacy” you mean a long period without sexual intercourse, there is no medically defined point at which a woman’s body becomes damaged or “needs” sex.
Some things that can happen are:
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No dangerous buildup occurs. Semen does not accumulate in the body, and the vagina does not become “dirty” or permanently closed.
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Sexual desire can change. Libido varies naturally with hormones, stress, relationships, medications, age, and many other factors.
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Vaginal dryness can occur, particularly around menopause or with certain medications. Lack of sex itself isn’t generally the cause.
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If intercourse resumes after a long gap, some women may experience temporary discomfort, especially if there isn’t enough arousal or lubrication. A water- or silicone-based lubricant can help.
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Pelvic-floor muscles don’t simply “weaken” because someone isn’t having sex.
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There is no health requirement to have intercourse. A person can remain sexually inactive for months or years without this, by itself, causing a medical problem.
If someone has persistent vaginal pain, bleeding after sex, unusual discharge, severe dryness, or other new symptoms, those deserve evaluation rather than being attributed simply to sexual inactivity.
