SEXUAL TENDENCIES IN MONKEYS 307 



immaturity. The same kind of observations were made with 

 reference to Jimmy II: even after he became sexually mature, 

 and had free, outdoor access to females, he would use male 

 monkeys as he used females, but this behavior became much less 

 frequent after sexual maturity than it was during sexual imma- 

 turity. 



The eunuchs and the immature male (Mutt) were apt to 

 detach themselves from the other members of the band, and to 

 engage in such activities as mock fights, flea-hunts, races through 

 the trees, etc. After a period of play they would huddle together, 

 with arms around one another. Much smacking of lips would 

 follow, and then they would copulate with one another, first one 

 animal, then another, assuming the female position. 



During the time that these eleven monkeys were at large I was 

 never able to observe a sexually mature (uncastrated) Monkey 

 assume the female position for copulation with a weaker fellow. 

 Sobke, for example, would use Jimmy II as he would use a 

 female, but would not assume the female position for Jimmy II. 

 On the other hand, even the adult eunuch would assume the fe- 

 male position for Mutt and Baby, both of whom were much smaller 

 and weaker than he. Sobke was always larger than Jimmy II, 

 but before these two animals arrived at sexual maturity one 

 was as apt to assume the female position during homosexual 

 relations as was the other. 



The only instance of homosexual relations between females 

 that I could attribute to sexual desire on the part of both animals 

 occurred when I allowed Kate to join the band. She had not 

 had access to her daughter, Gertie, for more than a year, but as 

 soon as she and Gertie met outdoors they rushed into an embrace, 

 following which Gertie assumed the female position and Kate 

 mounted her daughter. The mother made male copulative 

 movements, and both animals smacked their lips and displayed 

 marked excitement. This behavior was never repeated, although 

 the two animals were at large together for several weeks. 



Situation 8. Mature male and immature male, having formed 

 a friendship for one another, are separated. 



Observation 12. 14- Jimmy II-M-c (sexually mature) and 

 24-Mutt-M-cr (sexually immature) had been with a band con- 

 sisting of females and other males. They all had access to the 

 alley and four of the cages. Although Jimmy II cohabited 



