David Arquette To Howard Stern: Courteney And I Haven't Had Sex In Four Months

David Arquette isn't staying quiet about his separation with Courteney Cox ... admitting on the Howard Stern Show this morning that he and the Mrs. haven't gotten busy in the bedroom in four months ... since before Scream 4 began filming. TMI!

As for their "trial separation," Arquette says it was Courteney's idea ... and she made the suggestion after their 11th anniversary which was back in June. Mrs. Cox-Arquette apparently told David that she was "tired of being your mother." Ouch!

David tells the shock jock:

"I've been going to therapy. I'm trying to grow up. I'm trying to be my true self ... trying to figure out myself and my world."

Arquette may not be having sex with Courteney, whom he says he still loves, but he is admitting to having sex with Jasmine Waltz ... the woman he refers to as his "one conquest."

Oh, David ... drinking and doing live radio interviews don't go hand in hand.

Check out a snippet of a strange-sounding David on the Howard Stern Show this morning ...