Chambers Twentieth Century Dictionary
Published 1977, editors AM Macdonald OBE BA(Oxon), 1594pp.
Perv quotient: 176 headings÷1594 pages = 0.11 (higher scores indicate higher levels of perversion)
The dotdotdotcomma verdict:
Always more cerebral than your average dick'n'harry, this edition is scant on modern slang, but its editor, while avoiding the obvious, has meticulously promoted some gloriously obscure examples in support of the case for his coprolalia (qv).