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Proceptivity and receptivity in the female rat are indicators of sexual motivation, thus indicating a direct relationship between estrogen levels and sexual motivation. In addition, female rats receiving doses of estrogen and progesterone were more likely to exert effort at gaining sexual attention from a male rat. [17]
In 2022, the Journal of Sex Research published a study of 26,542 men and 33,534 women that had entered same-sex unions in the Netherlands as compared with 4,607,785 men and 4,405,635 women that found robust evidence of a fraternal birth order effect on both male and female homosexuality and no support for a female fecundity effect, but the ...
Early research into the differences between male and female brains showed that male brains are, on average, larger than female brains. This research was frequently cited to support the assertion that women are less intelligent than men. [83] [84] One of the most influential early researchers on this topic was Paul Broca. In 1861, he examined ...
Research on women and testosterone has been limited, but as more is done, experts are seeing that the hormone affects the female sex drive, just as it does the male. It also plays an essential ...
For women, a drop in estrogen can cause weight gain, particularly in the abdomen (aka menopause belly). For men, low testosterone is linked to an increase in fat mass. Men with obesity are more ...
The suprachiasmatic nucleus is also known to be larger in men than in women. [39] An analysis of the hypothalamus by Swaab and Hofman (1990;2007) found that the volume of the SCN in homosexual men was 1.7 times larger than a reference group of male subjects, and contained 2.1 times as many cells.
5α-Reductase inhibitors have minimal side effects and are well tolerated in both men and women. [219] [220] In men, the most common side effect is sexual dysfunction (0.9–15.8% incidence), which may include decreased libido, erectile dysfunction, and reduced ejaculate.
All published cases providing sexual orientation grew up to be strongly attracted to women. The failure of these experiments demonstrate that socialization effects does not induce feminine type behavior in males, nor make them attracted to men, and that the organizational effects of hormones on the fetal brain prior to birth have permanent effects.
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