The `Candy` singer - who is expecting his first child with wife Ayda Field - tried to shoot some X-rated footage when he was younger but the camera didn`t work and he now wishes he had a video record of his sexual escapades.
He told GQ magazine: "I haven`t made a sex tape. I think I was videoed once but it didn`t work. But it had been set up.
"I was obviously glad it didn`t work because it involved copious amounts of cocaine and playing snooker with a rope.
"Right now, being married for so long, if I could go back in time I`d have done a couple of sex tapes I think."
Robbie, 38, also admitted falling in love with actress Ayda has stopped him worrying about what other people think of him because she has made him realise he is a "good person".
He said: "There`s so much positive stuff going on with the two of us, she`s really kind and positive and attentive and wants the best for people and wants to help them.
"And once I`d seen that in her, it made me feel good that she wanted to be with me, which must mean that I`m actually good, so I was like, `Well let`s cultivate this.`
"I went all the way through my twenties thinking I was sentenced to a lifetime of mental imprisonment but I`m in a better place now."