Mess steward in the Middle East to a Sgn Ldr Medic at breakfast on his way to the FE on a trial in the late 60's asked advice as to why his sex life was failing in the heat and asked for a solution . Looking at his meal the Medic sought inspiration and replied " Try Kippers!".
The law of sod being what it is the same confrontation occured on the Sqn Ldr''s return journey from the trial, again at breakfast where said steward complained that he had been eating dozens of same to no effect,,,
"Eating?, No rub them on man, rub them on!"