Yang L Y, Clemens L G
Department of Zoology, Michigan State University, East Lansing 48824, USA.
Physiol Behav. 1998 Feb 15;63(4):675-82. doi: 10.1016/s0031-9384(97)00523-4.
Female rats "pace" their sexual contacts with the male when tested in situations where they can escape from the male during copulation. The type and quality of vaginocervical stimulation that the females receive during copulation influences their pacing behavior. This study investigated the effect of several male-related stimuli on the female's postejaculatory refractory period (PER). Females were tested in a two-compartment test chamber from which they could escape the male through one of four openings along the bottom of the barrier separating the two compartments. Experiment 1 examined the influence of the seminal plug, the penile cup, and prostate secretions on the female's PER. Results showed that neither the seminal plug, the penile cup, nor prostate secretions contributed to the female's PER. Experiment 2 investigated the relation of pre-ejaculatory intromission frequency, ejaculation duration, and the number of pelvic thrusts during ejaculation to the female's PER. Results indicated that pre-ejaculatory intromission frequency and ejaculation duration but not the number of pelvic thrusts during ejaculation were significantly correlated with the female's PER. In addition, pre-ejaculatory intromission frequency was significantly correlated with ejaculation duration. Partial correlation analysis suggested that pre-ejaculatory intromission frequency affected ejaculation duration which, in turn, influenced the female's PER. This finding was further supported by the evidence that ejaculation duration and the female's PER were significantly shorter in tests in which the male ejaculated on the first or second intromission.
在可在交配期间逃离雄性的情况下进行测试时，雌性大鼠会“控制”与雄性的性接触。雌性在交配期间所接受的阴道宫颈刺激的类型和质量会影响它们的控制行为。本研究调查了几种与雄性相关的刺激对雌性射精后不应期（PER）的影响。雌性在一个两室测试箱中接受测试，在该测试箱中，它们可以通过分隔两个隔室的屏障底部的四个开口之一逃离雄性。实验1研究了精液栓、阴茎套和前列腺分泌物对雌性PER的影响。结果表明，精液栓、阴茎套和前列腺分泌物均未对雌性的PER产生影响。实验2研究了射精前插入频率、射精持续时间和射精时骨盆推力次数与雌性PER的关系。结果表明，射精前插入频率和射精持续时间与雌性的PER显著相关，而射精时骨盆推力次数与雌性的PER无显著相关性。此外，射精前插入频率与射精持续时间显著相关。偏相关分析表明，射精前插入频率影响射精持续时间，进而影响雌性的PER。在雄性在第一次或第二次插入时射精的测试中，射精持续时间和雌性的PER显著缩短，这一证据进一步支持了这一发现。
