Abstract
We used a one-month daily diary assessment to measure menstrual cycle-related changes in same-gender and other-gender sexual motivation and behavior in 148 cisgender women (32% lesbian-identified, 35% bisexually identified, and 33% heterosexual-identified). Women with exclusive same-gender orientations reported increased motivation for same-gender sexual contact during the higher-fertility phase of the cycle, but women with exclusive other-gender orientations did not show a parallel increase in other-gender sexual motivation during the higher-fertility phase. Bisexually attracted women showed no phase-related changes in same-gender or other-gender sexual motivation, regardless of whether they generally preferred one gender versus the other. Rates of partnered sexual contact did not increase during the higher-fertility phase. During the 14 midcycle days during which we assayed salivary estrogen and testosterone, we found no significant associations between daily hormones and sexual motivation. However, daily estrogen levels were positively related to sexual behavior among women currently partnered with women, and negatively related to sexual behavior among women currently partnered with men. Our results suggest that traditional evolutionary models of menstrual cycle-related changes in sexual motivation do not adequately reflect the full range of cycle-related changes observed among sexually diverse women.
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