In other organisms, such as bees and wasps, in which females develop from fertilized eggs and males develop from unfertilized eggs, distribution of the sexes is unequal.
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Meaning "sexual intercourse" first attested 1929 (in writings of D. Lawrence); meaning "genitalia" is attested from 1938.
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But this is not the whole story, and it applies universally only to mammals and birds.
In other animals sex is often determined by environmental factors and can be a variable phenomenon.
Sex is usually determined by anatomy, the makeup of the sex chromosomes, and the type and amount of hormones produced.
When the sex of an organism is determined by the sex chromosomes, males and females are generally produced in equal numbers.
These slipper limpets show the evolutionarily advanced feature of internal fertilization, and the male on top extends his reproductive organ down the pile of females below him to fertilize their eggs.Tags: Adult Dating, affair dating, sex dating