Vasey Paul L, Foroud Afra, Duckworth Nadine, Kovacovsky Stefani D
Department of Psychology and Neuroscience, University of Lethbridge, Lethbridge, Alberta, T1K 3M4, Canada.
Arch Sex Behav. 2006 Apr;35(2):117-29. doi: 10.1007/s10508-005-9007-1. Epub 2006 Apr 26.
Mounting is generally considered to be a male-typical behavior. Female Japanese macaques, in certain populations, are unusual, in that they routinely mount other females. In this study, we examined to what extent female Japanese macaques mount same-sex partners in a male-typical manner. We compared the mount postures males and females adopt and their rate of pelvic thrusting. In addition, we employed a modified form of Laban Movement Analysis (LMA) to compare patterns of pelvic movement during mounts. LMA is a universal language for movement that describes quantitative features of movement, such as changes in the relation of the body segments, as well as qualitative features, such as the style of movements. Our results indicate that female Japanese macaques do not mount in a male-typical manner. Females exhibited a much greater variety of mount postures than did males. Some of the most common types of mount postures employed by females were never exhibited by males. Females performed fewer pelvic thrusts per mount than males, but they executed more pelvic movements per mount, as well as, greater variety and complexity of movement. In addition, the qualitative style of pelvic mounting that females employed differed, in general, from that of males. We argue that these sex differences in mounting can be explained by the fact that both sexes sought sexual reward via genital stimulation during mounting, but they did so in different ways owing to the constraints imposed by their genital architecture. This study raises the larger question as to what constitutes a male-typical or female-typical behavior.
爬跨行为通常被认为是雄性特有的行为。在某些群体中，雌性日本猕猴却与众不同，因为它们经常会爬跨其他雌性。在本研究中，我们考察了雌性日本猕猴以雄性特有的方式爬跨同性伙伴的程度。我们比较了雄性和雌性采用的爬跨姿势以及它们的骨盆推顶频率。此外，我们采用了一种改良形式的拉班动作分析（LMA）来比较爬跨过程中骨盆运动的模式。LMA是一种通用的动作语言，它描述动作的定量特征，如身体各部分关系的变化，以及定性特征，如动作风格。我们的结果表明，雌性日本猕猴并非以雄性特有的方式进行爬跨。雌性表现出的爬跨姿势比雄性多得多。雌性采用的一些最常见的爬跨姿势，雄性从未表现过。雌性每次爬跨时进行的骨盆推顶次数比雄性少，但它们每次爬跨时执行的骨盆动作更多，动作的多样性和复杂性也更高。此外，雌性采用的骨盆爬跨定性风格总体上与雄性不同。我们认为，这些爬跨行为中的性别差异可以通过以下事实来解释：两性在爬跨过程中都通过生殖器刺激寻求性奖励，但由于其生殖器结构的限制，它们以不同的方式这样做。这项研究提出了一个更大的问题，即什么构成了雄性典型或雌性典型行为。
