xamples of penile morphology in some primates

Alan Dixson, Sexual selection, genital morphology, and copulatory behavior in male Galagos, 1989: International Journal of Primatology 10(1):47-55

https://www.researchgate.net/publication/226490834_Sexual_selection_genital_morphology_and_copulatory_behavior_in_male_Galagos