
John Curtis Holmes (August 8, 1944 – March 13, 1988) better known as John C. Holmes or Johnny Wadd (after the lead character in a series of related films), was one of the most prolific European Amercian male porn stars of all time, appearing in about 2,500 adult loops, stag films, and pornographic feature movies in the 1970s and 1980s. He was best known for his exceptionally large penis, which was heavily promoted as being the longest, thickest, and hardest in the porn industry, although no definitive measurement of Holmes' actual penis length exists. Near the end of his life, Holmes attracted notoriety for his involvement in the Wonderland murders in 1981, and eventually for his death from complications caused by AIDS.
Holmes was the subject of several books, a lengthy essay in Rolling Stone magazine, two feature length documentaries, and was the inspiration for two Hollywood movies, Boogie Nights and Wonderland.
Description above from the Wikipedia article John Holmes (pornographic actor), licensed under CC-BY-SA, full list of contributors on Wikipedia

Fantasm Comes Again
1977 · as Stud

Playboy: The Story of X
1998 · as Self (archive footage)

Fantasm
1976 · as Neptune

Night Screams
1987 · as Porno star on TV (archive footage)

Wadd: The Life & Times of John C. Holmes
1999 · as Self (archive footage)

Electric Blue 15
1984 · as Himself

Aphrodisiac: The Love Secret
1971 · as Boss

Panorama Blue
1974 · as Second Fantasy Guy

Teenager
1974 · as Police Desk Officer

Breast Orgy
1972

Sex and the Single Vampire
1970 · as Count Spatula / Bella Donna

The Hunter
1971 · as Horse

Evil Come Evil Go
1972 · as Pool Player

Kama Sutra '71
1970 · as John

Sex O’Clock USA
1976 · as Porn Actor

Anomalies: A World of Dreams
1970

The Danish Connection
1974 · as Johnny Wadd

The Pimp Primer
1970 · as Party Guest