Following graduation from St. John's Preparatory School in New York City, John enlisted in the U.S. army in 1969. While serving in the army Buco worked as a disc jockey for a radio station down south. John finished his service with the army in February, 1972 and returned to New York City. Buco answered an ad in The Village Voice placed by Lawrence T. Cole which led to him appearing in his first hardcore loop in mid-1972

Keyholes Are for Peeping
1972 · as Guy #2 in 4-Way (uncredited)

Sweet Wet Lips
1977

The Fury in Alice
1976 · as Plumber

Mondo Porno
1971 · as Guy in Green Shirt

Breakdown
1974

High Priestess of Sexual Witchcraft
1973 · as Satanist (uncredited)

Water Power
1976 · as Jack Gallagher

Angel Number 9
1974 · as Guy at Party

Millie's Homecoming
1971 · as Repairman #2

Slip Up
1975 · as Henry Draggrass

Guess Who's Coming
1973 · as Tom

Bizarre Moods
1976 · as Skip

Revolving Teens
1973 · as John (uncredited)

The Perfect Position
1977 · as Jack

The School for Sexual Arts
1975 · as Dean Lipshitz

The Dark Side of Danielle
1976 · as Uncle Frank / Hooded Ritualistl

Sin of Lust
1975 · as Alan Hartman

That Lady from Rio
1976 · as Rocco