Lemmon W B, Allen M L
Folia Primatol (Basel). 1978;30(1):80-8. doi: 10.1159/000155856.
Daily observations during a 5-year period showed that the mean frequencies of copulation per day during various sexual states of the female chimpanzee were almost identical, except for during maximum tumescence and lactation. The mean frequency of observed copulation peaked during maximum tumescence and was lowest during lactation.
在5年期间的每日观察表明,除了在最大肿胀期和哺乳期外,雌性黑猩猩在不同性状态下每天的平均交配频率几乎相同。观察到的交配平均频率在最大肿胀期达到峰值,在哺乳期最低。