Intended for or restricted to adults; specifically (of books, films, etc.) unsuitable for or prohibited to children because of violent or sexually explicit content.
Origin
Early 20th century; earliest use found in The Chicago Defender. From adults, plural of adult + only.
Definition of adults-only in US English:
adults-only
adjectiveˌadʌltsˈəʊnli
Intended for or restricted to adults; specifically (of books, films, etc.) unsuitable for or prohibited to children because of violent or sexually explicit content.
Origin
Early 20th century; earliest use found in The Chicago Defender. From adults, plural of adult + only.