The male dinosaur has been going out with the female dinosaur for two thousand years and finally he asks her for a kiss. She agrees.
Four thousand years later he asks if they might hug a little, and she agrees.
Three thousand years later he says, “Look, honey, we have been seeing each other for about nine thousand years. Don’t you think it is about time we… er… you know, get it on?” She looks at him shyly, and says, “Oh, darling I would love to, but I’m having my decade.”