Rocker Gene Simmons has managed to hold down a longterm relationship for over two decades only because his partner allows him to sleep with as many women as he wants.

The KISS star, who claims to have had sex with an estimated 4,600 women, has been with his girlfriend Shannon Tweed for 22 years and believes the only reason they're still together is because they never got married.

The 56-year-old says, "I have been happily unmarried for 22 years and we have two great kids but neither of us has dominion.

"Loving someone and caring about someone does not mean they have the right to own you. She will mount the milkman if she wants, so relax, why torture each other?

"You have to be committed to a marriage. If that doesn't sound like a madhouse, I don't know what does.

"I am the only one I know who has never been divorced. The biggest cause of divorce is marriage."