The Betazoid phase or more commonly known as "the Phase" was a physiological phase that all Betazoid and half-Betazoid females entered during mid-life, similar to Human menopause. It was only during "the Phase" that a Betazoid female became fully sexual as the sex drive of the female in question quadrupled or more. Some females engaged in sexual relationships with any male available while others focused their attention on a single male who would later become her husband. In the event that a male spurned the female's advances, the female would be deeply offended and take the rejection personally. In some cases, the female's telepathic abilities were impeded by "the Phase".

At the beginning of her relationship with William T. Riker, Deanna Troi "warned" Will of "the Phase", although she did not tell him that her sex drive could increase by more than four times in case that might have frightened him.

In 2365, Lwaxana Troi entered "the Phase", making advances on William Riker, Jean-Luc Picard as well as a hologram, Rex. (TNG: "Manhunt")

Deanna Troi experienced symptoms that could be attributed to the Phase in 2369 after a telepathic link to Ambassador Ves Alkar caused her to artificially age. Troi displayed an overt sexual aggressiveness and even attempted to seduce several members of the Enterprise crew. (TNG: "Man of the People")

It is unclear how accurate an analogy this phenomenon is to Human menopause. When describing the condition, Counselor Troi does make the comparison, (TNG: "Manhunt") though the one Betazoid seen to go through the Phase, Lwaxana Troi, has a child seven years later. (DS9: "The Muse") Human menopause, of course, means the end of a woman's capacity to have children, and so this wouldn't be expected to be the right comparison. In fact, the slang term "baby rabies" is used to refer to the ardent desire to have a child that often hits human women in their 30s and 40s who hadn't had one earlier, which may be a closer analog to the Betazoid Phase than menopause.

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