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People who have a sexual relationship that is not romantic, but where they are also (and are supposed to behave like) friends. Often a casual relationship, but not always. FWBs may or may not be exclusive.
A steroid hormone in people’s bodies, which is also included synthetically in hormonal birth control methods.
In a sexual context, when a kind of sex involves someone putting one body part inside the body part of another person, such as with intercourse. Some people use the word “penetration” instead.