From, the incel encyclopedia

Childlessness is the state of not having children. This can be by choice, for example if one prefers a childfree lifestyle and/or supports philosophical anti-natalism. It can also be involuntary.

Genetic Dead End is a near-synonym, although there are some edge cases. Someone who adopts a child instead of having their own would be a genetic dead end, but not childless. Someone who donates sperm or ova but doesn't raise a child would be childless, but not a genetic dead end.

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