FIRST OFF . . .

After years of guests baring their souls on her syndicated talk show, Sally Jessy Raphael is about to give new meaning to the term national exposure when she allows five nudists to appear unclothed today before her New Haven, Conn., studio audience. TV viewers will see only close-up shots of the nude guests when the show airs Feb. 5 (locally at 1:30 p.m. on KHJ-TV Channel 9), a spokesman said. The guests--who include a married couple and a mother and daughter--weren’t forced to appear nude; they decided to do so because the show is about nudity.