A gay porn star has claimed that he had a sexual relationship with Superman actor Christopher Reeve.

Cal Culver told an interviewer before his death in 1987 that the pair had a relationship, but the claim has only just been unearthed.

The lost interview has been included in new book Hollywood Babylon Strikes Again.

According to the Globe, which obtained extracts from the book, Culver told the interviewer that he and Reeve were intimate during the mid-1970s and met while auditioning for the same Broadway role.

Culver, who performed in porn films under the name Casey Donovan, said: “Christopher was a great lover and I think I liberated him sexually. I didn’t think he was gay but he seemed willing to try anything once. He was curious.”

He claimed that Reeve was the “man of my dreams” and said the affair lasted two months until the star discovered he worked in gay porn.

Reeve became famous for playing Superman in 1978. He was married to his wife Dana for 12 years and had one son with her, plus two children from his previous marriage.

The actor was paralysed from the shoulders down in 1995 after falling from a horse. He died of heart failure in 2004.