Denise Richards is still disturbed by her ex-husband Charlie Sheen's claims she emailed him asking for a sperm donation.

The actress admits Sheen's allegations are worse than any crazy gossip she has read or heard about herself - and she cannot believe her ex would stoop so low.

She says, "I had to have an AIDS test after I left him. Why would I want his sperm?"

Richards admits the allegation has prompted her to cut all ties with Sheen, admitting she's sick of trying to thaw frosty relations with the actor.

She adds, "I don't care. I'm done with Charlie. I'm at a point where I'm sick of it, and now I'll just talk because I've had three years of this. It's crazy."