Saito T R
Jikken Dobutsu. 1987 Jan;36(1):91-3. doi: 10.1538/expanim1978.36.1_91.
The male's sexual behavior paired with estrogen-progesterone primed induced ovariectomized receptive females was compared with natural proestrous females. The former showed longer ejaculation latency and more intromissions to the first ejaculation than the latter.
将与雌激素 - 孕酮预处理的去卵巢易接受雌性配对的雄性性行为与自然发情前期的雌性进行比较。前者比后者表现出更长的射精潜伏期和首次射精前更多的插入次数。