1) Bang 2) Be intimate 3) Bonk 4) Capital of France 5) Copulate 6) Couple 7) Dismal grade 8) Do it 9) Exclusively Saxon word 10) Exclusively Anglo word 11) Failing grade 12) False start 13) Family first 14) Fire starter 15) Fresh start 16) Fuck 17) Gee antecedent 18) Gee preceder 19) Get it on 20) Get laid Found on https://www.crosswordclues.com/clue/eff
Electronic Frontier Foundation - an organisation concerned with the social and legal issues surrounding the use of computers
Found on http://www.archivemag.co.uk/