1) Creepo 2) Creepy sort 3) Degenerate 4) Deviant 5) Deviate 6) Dirty old man 7) Erotic yearning 8) Exclusively Saxon word 9) Exclusively Anglo word 10) Lascivious one 11) Lascivious type 12) Lecher 13) Lewd character 14) Licentious one 15) Old goat 16) Pervert 17) Pervy person 18) Prurient man 19) Satyr 1) Lech 2) Lecher 3) Satyr 4) Sleaze 
• (n.) Strong desire; passion. (Archaic). • (v. & n.) See Leach.
Letch (lĕch) v. & noun See Leach . Letch noun [ See Lech , Lecher .] Strong desire; passion. (Archaic). « Some people have a letch for unmasking impostors, or for avenging the wrongs of others.» De Quincey. 
Letch is British slang for a lecherous person.