Department of Psychology, University of Lethbridge, Lethbridge, Japan.
Department of Psychology, University of Lethbridge, Lethbridge, Japan.
Horm Behav. 2018 Sep;105:166-176. doi: 10.1016/j.yhbeh.2018.08.009. Epub 2018 Sep 4.
We assessed the effect of a progestin-based contraceptive treatment (chlormadinone acetate) on female heterosexual and homosexual behaviors in a free-ranging group of Japanese macaques (Macaca fuscata) living at Arashiyama-Kyoto, Central Japan. The data included estimated intensity of fertility cues, sexual solicitations and mounting behaviors collected daily during 17 consecutive mating seasons (1995-2012) from 159 females. Females that were on contraception: (1) exhibited less intense cues of putative fertility and for shorter periods; (2) were solicited by fewer males, and those males that did solicit them did so less often (i.e., lower heterosexual attractivity); (3) solicited fewer males and when they did perform sexual solicitations they did so less often (i.e., lower heterosexual proceptivity); (4) engaged in shorter heterosexual consortships with fewer male partners (i.e., lower heterosexual receptivity), compared with females that were not on contraception. In contrast, contraceptive treatment had no significant effect on the prevalence, occurrence, frequency, or duration of female homosexual behaviors. Even though heterosexual and homosexual behaviors can both be considered sexual in character and under hormonal control, our results suggested they are, to some extent, dissociable. Because females engaging in homosexual interactions showed less intense cues of putative fertility than those engaging in heterosexual interactions, regardless of contraceptive treatment, we argued that the hormonal threshold required for the expression of heterosexual behavior by females was associated with elevated sex hormones levels compared to homosexual behavior. We discussed the hormonal correlates of sexual behavior and partner preferences in Japanese macaques.
我们评估了孕激素避孕药（醋酸氯地孕酮）对日本猕猴（Macaca fuscata）中雌性异性恋和同性恋行为的影响，这些猕猴生活在日本京都嵐山。该数据包括 1995 年至 2012 年 17 个连续交配季节期间，每天收集的 159 只雌性猕猴生育线索、性邀请和交配行为的估计强度。使用避孕药的雌性：（1）表现出较弱的生育线索且持续时间较短；（2）较少受到雄性的邀请，那些邀请它们的雄性也较少（即异性恋吸引力较低）；（3）较少邀请雄性，并且当它们进行性邀请时，也较少（即异性恋求爱较低）；（4）与未使用避孕药的雌性相比，与较少的雄性伴侣进行较短的异性恋交配（即异性恋接受度较低）。相比之下，避孕药治疗对雌性同性恋行为的发生率、发生、频率或持续时间没有显著影响。尽管异性恋和同性恋行为都可以被认为具有性特征并受激素控制，但我们的结果表明，它们在某种程度上是可分离的。由于进行同性恋互动的雌性表现出较弱的生育线索，而与进行异性恋互动的雌性相比，无论是否使用避孕药，我们认为雌性表达异性恋行为所需的激素阈值与性荷尔蒙水平升高有关，而与同性恋行为相比。我们讨论了日本猕猴性行为和伴侣偏好的激素相关性。
