Michael Douglas shows Catherine Zeta-Jones playing golf

Michael Douglas revealed his marriage of almost 23 years to Catherine Zeta-Jones is still hot and heavy – even on the green.

The couple regularly play golf together, and they have their own special penalties to keep it sharp.

“The rules are – I have to flog it if I don’t hit it past the women’s tee box, which I manage most of the time,” Douglas, 78, told the Guardian. “But there were times when we were playing alone and we had to put on a little show for her because we Are competitive.”

The “Basic Instinct” and “Ant-Man” legend then clarified, “But only if I play with my wife.”

Zeta-Jones, 53, previously dropped her erotic rule during an appearance on The Graham Norton Show.

“I’m pretty good, better than him, and we have a bet that if he ducks a shot, he’ll have to drop his pants,” she said during the 2016 interview.

The “Chicago” Oscar winner revealed that she doesn’t just make this bet with her Oscar-winning husband — but with “every man” she plays against.

“There was a problem with paparazzi, so I let him go into the bushes. A deal’s a deal,” Zeta-Jones quipped.

Douglas and Zeta-Jones have been married since November 2000 and have two children together: Dylan, 22, and Carys, 19. Douglas has another son, Cameron, 44, from a previous marriage to Diandra Luker.

Hollywood stars often post romantic messages on Instagram.

Douglas shared a black and white photo of them on Valentine’s Day with the caption, “Happy Valentine’s Day to my beloved Catherine! I love you so much.”