Definition & Meaning of "anal intruder"in English

What is the origin of the term "anal intruder" and how is it used?

"Anal intruder" is a slang term for a man who takes the penetrating role during anal sex with another man. It likely emerged in late 20th-century English as a direct, descriptive metaphor, with "intruder" emphasizing entry and activity in a sexual context. The term is mostly used in informal, sexualized, or joking contexts among peers or online, often in gay subcultures. It is vulgar and explicit, and its offensiveness depends on context: neutral within consensual sexual discussion but derogatory if used to shame or insult.