It’s possible that they were surgically altered (neutered).
Male chimpanzees, like other male mammals, exhibit patterns of behavior toward females that disarm females’ resistance to mating. These behaviors may include physical force and would be described in human terms as sexual assault or rape, or they may be more indirect, as when males engage in activities that partition females from other males. An example of direct sexual coercion is a male physically keeping an ovulating female to himself, which limits sperm competition. An example of indirect form of sexual coercion is a male killing infant babies that he believes are not his own. This may be an effort to spur the mother into becoming fertile again so that he can mate with her. Female chimpanzees also kill the babies of other chimp mothers.
https://sciencing.com/chimpanzee-mating-habits-6703991.html
#14 so their democrats....