A 40-year-old sex tape allegedly featuring late musician Jimi Hendrix is being sold on the internet.

LA adult firm Vivid Entertainment said it obtained the 11-minute clip from a rock'n'roll memorabilia collector.

It reportedly shows the legendary guitarist engaged in sex acts with two women in a dimly-lit hotel room.

However, Hendrix's long-time girlfriend Kathy Etchingham questioned the authenticity of the video, telling the New York Times: "It is not him."

After looking at still pictures from the tape, she said: "His face is too broad and nose and nostrils too wide for Jimi."

The footage will be packaged in a 45-minute DVD by Vivid, which also distributed the famous sex tape featuring Pamela Anderson and Tommy Lee.

Hendrix died in London in September 1970, aged 27.