Jack Nicholson says men act like dogs after having sex.

"The Shining" actor - who is famous for his womanizing ways - says all guys forget about women one hour after having sex with them, just like canines.

He said, "We have more in common with a male dog than we do with a woman in this department. This may be male chauvinism in a certain context. But, baby, it's also science!"

"I don't have much philosophy other than 'live in the now'. And that's very difficult to do. Don't leave something that you really want to do undone."

But father-of-five Jack also said his promiscuous lifestyle in the 60s could have lead to him fathering up to "9,000" children.

He laughed, "There could be 9,000 for all I know - I used to live so freely."

Jack, who smashed a motorist's car window with a golf club in 1994, says golf still brings out his fiery temper.

The 70-year-old star told Men's Journal magazine, "I'm not a very Zen guy. I've laid in sand traps and cried, and hurled golf clubs in lakes."