Green’s Dictionary of Slang

(orig. US) (performing) oral sex.

1888–94		‘Walter’ My Secret Life (1966) III 474: I did not like either cock-sucking or cunt-licking at that epoch, and stopped Kitty who was bent on stiffening it with her mouth.
1914		in Faderman & Timmons Gay L.A. (2006) 35: ‘In the majority of these cases [...] their offence is nothing more or less than “cocksucking”’ [Simes:DLSS].
1919		in L.A. Murphy Perverts by Official Order (1988) 49: ‘[H]e went down on me. They call it cocksucking’.
1927		W.W. Smith Letters from Father (1984) 70: Many Jews pay Christian girls liberally to suck their cocks. Particularly if their wives have an aversion to cocksucking.
1937		Confessions of Eng. Maid (1986) 135: This does not, of course, apply to those places known as French houses where cocksucking is the accepted practice [Simes:DLSS].
c.1940		‘Cary Grant in “Who’s a Fairy?”’ [comic strip] in B. Adelman Tijuana Bibles (1997) 101: If there’s any cocksucking to be done Franciska you can do it.
1949		‘Swasarnt Nerf’ Gaedicker’s Sodom-on-the-Hudson 23: There taketh place an ample amount of cruising, groping and downright cocksucking.
1954		A. Ginsberg Coll. Poems 1947-90 99: [H]alf-created paintings on the walls, fame,/ cocksucking and tears,/ money and arguments of great affairs,/ the culture of my generation.
1967		L. Bruce Essential Lenny Bruce 301: I learned five minutes of geography and ten minutes of cocksucking.
1978		L.K. Truscott IV Dress Gray (1979) 471: The butt-fucking and cock-sucking that went on.
1988		(con. 1940s) C. Bram Hold Tight (1990) 189: Navy kicked you out for cocksucking.
1992		R. Price Clockers 180: Some illegal tableau, from professional cocksucking to crack smoking.
2002		Sandmann ‘Burning Down the House’ Planet Sex Stories 🌐 He was speechless, so I moved up and started kissing and licking his black cuntbuster up and down its length. I enjoy cocksucking so much that sometimes I work myself into an orgasm without any pussy stimulation.
2012		J. Dicker Harry Quebert Affair (2015) 27: Cock sucking, blow jobs, giving head, playing the skin flute [...] America is a pecker paradise.