Gary Troy - Teenage Bride (1970)

This is a dodgy sex comedy with more plot holes than you could poke a stick at. There's a fair bit of hanky panky and generally the emphasis is on sleaze sleaze and more sleaze.

Plot synopsis:
Dennis, a collega dropout, arrives to stay with his unemployed Coors drinking stepbrother Charlie. Charlie has athleitc sex all over a house with his mistress (top billed redhead Sharon Kelly) and later with a blonde. Dennis has sex with his neglected sister in law, then with Kelly. A detective hired by Charlie does it with another blonde on a couch. The music includes sappy soft rock songs. The scenes are within typical 70s decors.

Summers and Kelly wents on to become 80s hard X stars.