Sex is the quality that makes a living thing male or female. This difference affects how it grows and has babies.
When people talk about sex, they usually mean whether a person is biologically male (has a penis) or female (has a vagina). But in conversations about relationships, "sex" can also refer to intimate contact between two people - although this usage often carries a more adult connotation. Some people might use the word when discussing attraction, intimacy, or even just being romantic with someone.
A category into which sexually-reproducing organisms are divided on the basis of their reproductive roles in their species.
Example: The effect of the medication is dependent upon age, sex, and other factors.
To determine the sex of an animal.
