Green’s Dictionary of Slang

(UK society) an overly amorous young man; also used of the concept itself.

1982		Barr & York Sloane Ranger Hbk 159: MTF adj. Must touch flesh. Female description of an octopus Sloane.
1983		J. Mortimer Rumpole and the Golden Thread 188: He had a bad case of the M.T.Fs [...] Must Touch Flesh!
2001		Indep. Rev. 21 May 16: They weren’t nearly as innocent as you might think back in the Thirties, what with their acronyms for untrustworthy men: NSIT (Not Safe in Taxis) or MTF (Must Touch Flesh).
2024		J. Meades Empty Wigs (t/s) 575: [C]lassic D O M ... can’t begin to think how old... M T F ...