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Most mammals , including humans , are genetically determined as such by the XY sex-determination system where males have an XY (as opposed to XX) sex chromosome . It is also possible in a variety of species, including humans, to be XXY or have other intersex / hermaphroditic qualities, though one would still be considered genotypically (if not necessarily phenotypically) male so long as one has a Y-chromosome. During reproduction , a male can give either an X sperm or a Y sperm, while a female can only give an X egg. A Y sperm and an X egg produce a male, while an X sperm and an X egg produce a female .
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