Green’s Dictionary of Slang

sexual intercourse.

1989		Viz June/July 15: Britain will boom to the sound of bonking.
1995		D. Lodge Therapy (1996) 107: There’s no sex in it – no bonking, I mean.
1995		D. Monroe Wet, Cold State 205: Boinking. That’s what your brother, Davie, calls it.
2008		T. Dorsey Atomic Lobster 2: All the talk shows want to hear about is boinking.
2018		Canberra Times (ACT) 17 Feb. 🌐 Parliament’s new ‘bonking ban’ will deprive consenting adults of their dignity while encouraging them to be quieter about their affairs, a legal academic has said .
2020		Times 3 Oct. 🌐 [headline] Only a plonker would call time on sozzled bonking.