1) Carnal knowledge 2) Coition 3) Coitus 4) Congress 5) Copulation 6) Fuck 7) Fucking 8) Intercourse 9) Nookie 10) Nooky 11) Piece of ass 12) Piece of tail 13) Relation 14) Roll in the hay 15) Screw 16) Sex act 17) Sexual congress 18) Sexual intercourse 19) Sexual relation 20) Shag 21) Shtup 22) Slang for sexual intercourse Found on https://www.crosswordclues.com/clue/screwing
Screw'ing adjective & noun from Screw , transitive verb Screwing machine . See Screw machine , under Screw . Found on http://www.encyclo.co.uk/webster/S/39