Secrets of a door-to-door salesman (1973) - Wolf Rilla.

Following the sudden death of his father, former Lobster catcher David (Brendan Price) excitedly makes for the big smoke, exchanging barnacled lobster pots for the no less salty business of getting his leg over as a randy vacuum cleaner salesman. While dramatically inane, this sporadically saucy suburban romp is gaudily replete with tepid gags, delightfully dubious double entendres, beautiful, implausibly promiscuous young dolly birds, and much flesh-tinted farcing about. A fitfully amusing retro romp, Brendan Price isn't altogether vacuous, and director Rilla avidly exploits the increasingly lax censorship laws, exposing a plenitude of full-frontal female nudity. While the drab interiors exude a sitcom-y blandness, the bracingly wintry London exteriors are pretty fab, dishy David's vintage, open-topped jalopy is an appealingly whimsical conveyance, with his zaftig German girlfriend  Martina (Jean Harrington) being equally easy on the eyes!