Charlie Sheen's long-running divorce battle with Denise Richards has taken another bitter turn after the actor revealed his ex-wife asked him for a sperm donation.

The Scary Movie 3 & 4 actor told US TV show Entertainment Tonight that reports of the former Bond girl Richards wanting more children fathered by him "...are true. There is documentation that I'll show in court revealing the request for my 'donation.'"

Meanwhile, Sheen is currently trying to change his custody agreement with Richards in Los Angeles Family Court. According to New York Post, he wants a more relaxed agreement that would allow him to visit daughters Sam, 3, and Lola, 2, without the supervision of Richards' nanny, and to have more frequent access. Of the current situation, Sheen said the home he shares with new fiancée Brooke Mueller is suitable for his daughters, adding: "I can't be monitored anymore [...] I'm good enough to provide DNA but I'm not good enough to hire my own child care provider?"

Richards has denied asking Sheen for a sperm donation, telling New York Post: "I don't want another child right now. I have my hands full and am focusing on my children, my mother and my career. I thought I was past all this stuff."