SEX kitten Sharon Stone swings both ways when she struts her stuff onscreen.

Stone's been shocking the socks off movie fans since her steamy romp in Basic Instinct, in which she flaunted her flawless body with hunky Michael Douglas -- AND in lesbian love scenes with a butched-up character played by Leilani Sarelle.

She was at it again in this month's HBO flick, If These Walls Could Talk 2, getting between the sheets with lesbian Ellen DeGeneres in a story about a female gay couple who long to have a baby. Anne Heche, DeGeneres' real-life lesbian lover, directed the piece.

DeGeneres and Stone show plenty of lip-locking and simulate lesbian sex while Heche catches it all on camera. But the two-day shoot, says DeGeneres, left her itchy all over and reportedly put her at odds with co-star Stone. The sex scene was Heche's idea. DeGeneres reportedly confessed: "I didn't want to do it. It felt weird."

The "lovers" quarrel continues, it seems, even though Sharon is firmly heterosexual with a devoted husband, San Francisco newspaper editor, Phil Bronstein.

At a party to celebrate the cable movie, "Heche was heard commenting loudly to a crew member about the coldness between the actresses," says a report. "'Imean, you were there the day they wouldn't even talk or go near eachother!' Heche said."

Spokesmen for DeGeneres and Stone insist they get along fine. Maybe so, but a source says Stone still left the party early.

DeGeneres, who joined Hollywood's gay power base when she dragged her TV sitcom character out of the closet, continues her battle to convince your people that going gay is OK.

Her latest campaign is against family-values icon Dr. Laura Schlessinger, who makes no bones about her opinion that homosexuality is deviant and that gay couples have not right to have kids.

Schlessinger's intolerance led to the brutal murder of gay student Matthew Shepherd, DeGeneres charges. Schlessinger's attorney has said that she would rather not deabte Ellen in the media, but she is not homophobic.