F our chairs, side by side. Seated in the middle, two attractive young women, Helene and Vicki, holding hands. Flanking them on either side, looking very much alike, are two slim, handsome young men with ponytails, Brad and John, both dressed similarly, in black shirts and jeans. Brad is Helene's husband; John is Vicki's fiance. The two women are also lovers. The topic for the day, announced talk-show host Ricki Lake, was "couples who are bisexual and wouldn't have it any other way."