This chapter focuses on the concept of sperm competition among primates. It states that when a female primate mates with a number of partners, sperm competition may occur between the gametes of rival males, for entree into the ova. Relative testes size and mating systems in primates between non-primates are also examined. The chapter then defines sperm pleiomorphism of humans and relates it to sperm competition. It discusses the different male accessory reproductive organs such as vasa deferentia, seminal vesicles, and prostate gland. It also addresses the question: Does mating order influence male reproductive success, and do social or sexual stimuli affect sperm counts?
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