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A male (♂) organism is the physiological sex that produces sperm. Each spermatozoon can fuse with a larger female gamete, or ovum, in the process of fertilization. A male cannot reproduce sexually without access to at least one ovum from a female , but some organisms can reproduce both sexually and asexually. Most male mammals , including male humans, have a Y chromosome, which codes for the production of larger amounts of testosterone to develop male reproductive organs. Not all species share a common sex-determination system . In most animals , including humans, sex is determined genetically, but in some species it can be determined due to social , environmental, or other factors. For example, Cymothoa exigua changes sex depending on the number of females present in the vicinity.