Tiger Woods and Lindsay Vonn reportedly are considering matrimony--- with one gigantic stipulation.

Reports are the World Cup skier had told Woods she will marry him if he agrees to give her half of his estimated $600 million fortune in the event of a divorce. According to the National Enquirer, the two are now said to working through details of a prenuptial agreement.

“Tiger’s relationship with Lindsey has moved quickly,” The Inquirer reported. “The two have gotten so serious they’re already thinking about a wedding and kids.”

Woods — the No. 1 golfer in the world and fresh off a victory in The Players Championship — and Vonn were spotted this week with his two kids on his yacht in Palm Beach, Fla. Woods, 37, was previously married to Elin Nordegren before a cheating scandal wrecked his marriage and cost him upwards of $110 million in a divorce settlement.

Woods and Vonn, 28, went public with their relationship last March. The Enquirer reports, all his prior transgressions prompted the two to have a recent heart to heart.

“Tiger swore he’s a changed man and told Lindsey that he wants to buy her a ring this summer,” according to The Enquirer. “Lindsey told Tiger its insurance against him straying. Lindsey warned Tiger that he’ll also have to sign an agreement to give her a lump sum of $20 million for every incidence of cheating.”