It's not that Jenny Jones doesn't allow men in her audiences. That's illegal. It's just that she knows there will be a lot of jokes they won't get. That's why she calls her show "Girls' Night Out" - and hopes that men get the hint.

Jones, already a successful stand-up comic before she hit upon the Girls' Night Out idea, has apparently hit a gold mine with her "women only" shows. The Girls' Night Out shows have played to sold-out audiences around the country, and Warner Bros. has signed her up for both a syndicated TV talk show and a book deal.Jones will present Girls' Night Out Sunday, Feb. 24, at 7 p.m. at the Comedy Circuit, 10 N. Main, Midvale.

"I hesitate to call it a show," Jones explained in a recent phone interview. "I'm kind of hosting a party." She doesn't even turn the house lights down. Critics have called it a cross between stand-up comedy, a pajama party and group therapy, but in fact the stand-up takes a back seat to the therapy and the gossiping, says Jones.

The reason Girls' Night Out works, she says, is that it's spontaneous. "The sad thing is that the biggest laughs come from them, not from me. . .. A lot of older women come, and sometimes they surprise you. They're so uninhibited."

Jones is quick to point out that the evening is not "male bashing" and it's not "feminist." "If anyone is ever disappointed in the show, it's the strident feminists," she says.

Instead there is a lot of confidential talk about leg shaving, childbirth, PMS and men who say they'll call but never do.

Jones, a former fashion model, rock drummer and backup singer for Wayne Newton, also sings a few of her own compositions, including "The Obscene Call" and "The Pregnancy Song." Jones was a singer first, then moved on to stand-up comedy, winning the 1986 "Star Search" comedy grand prize. That led to comedy appearances as opening act for Kenny Loggins, the Pointer Sisters and Sammy Davis Jr.

She first tried out the Girls' Night Out concept in Canada. "I went as far away from L.A. as possible, in case it bombed," Jones explains. A thousand women had to be turned away from that first performance. Women, it seems, were just waiting for a chance to laugh about themselves.

Jones will debut a syndicated for-women-only talk show next fall, which will air locally on KSL-TV.

Tickets for Sunday's show are $15. For more information, call the Comedy Circuit, 561-7777.

- ALSO APPEARING THIS WEEKEND, at The Comedy Oasis, is Johnny Dark, a frequent guest on "The Tonight Show" and formerly a regular on "The Donny and Marie Show." Dark will perform tonight and Saturday, at 8 and 10 p.m., at the Comedy Oasis at Bentley's in the Marriott Hotel, 75 S. West Temple.

Also appearing with Dark is political comic Tom Sheikman.

Dark, who has appeared often in Las Vegas and on tours with performers from Ginger Rogers to Gladys Knight and The Pips, is known for his quiet humor and his vocal impressions. According to Comedy Oasis owner Bill Bronner, this weekend's performance will be one of the few small club appearances Dark will make in 1991. Tickets are $7.

- Audiences who like to laugh at or with lawyers will have a chance to do both at a special "Comics/Lawyers (Comics Slash Lawyers)" show Saturday night at 8:30. The show, a fund-raiser for the Student Bar Association, will be held in the Moot Court Room at the University of Utah School of Law.

Comics/Lawyers will feature political comedian and former lawyer Tom Sheikman, former lawyer Bill Bronner and Salt Lake attorney Ed Havas. Tickets are $5 in advance or $6 at the door. For more information, call 485-0111.