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because, genetically, we have weaker genes
Human females have XX chromosomes while human males have XY chromosomes.
Probably because all animals, human or otherwise are driven by the need to procreate. Besides, males of the species are not 'exclusively' interested in sex, females are quite interested too. Without that hormonal chemistry, a species would die out.
In humans the sex chromosomes are either X or Y. Males have XY and females have XX.
OVARY
All Shark species come in the regular distribution of both males and females.
An individual doesn't need sex in order to survive or be healthy. However the human species would eventually become extinct if no one had sex.
Ovaries
OVARY
Ovaries
XX is usual, XXX and X also result in a female.
Ovaries