It's Valentine's Day -- which, on TV tonight, means even more romance and sexiness than usual. Not to honor the spirit of holiday, but because Feb. 14 falls right in the middle of a sweeps month. In other words, for the most part, it's the same old shame old . . .
* "NBC Nightly News With Tom Brokaw" (6:30-7 p.m., Channel 11) -- But here's something truly special. Tonight is the night Bill Moyers slips into the chair vacated by John Chancellor and thus becomes the only regular broadcast-network commentator on a nightly newscast. His first essay, keyed to Valentine's Day, is devoted to an analysis of whether life really is like a box of chocolates. (Just kidding. I hope.) NBC.
* "Buffy the Vampire Slayer" (8-10 p.m., Channel 45) -- This 1992 comedy is the perfect type of movie for Fox to televise, because it features the screen debut of one of the network's leading men, Luke Perry of "Beverly Hills, 90210." Kristy Swanson stars as the Valley Girl turned fearless vampire killer, with Donald Sutherland offering playful support and Paul Reubens, in a role that's disarming in more ways than one, proving there is life, of a sort, after Pee-wee Herman. Fox.
* "Me and the Boys" (8:30-9 p.m., Channel 2) -- The last time Robin Givens appeared on a TV sitcom was when she was a regular member of "Head of The Class." Tonight she guest stars on Steve Harvey's "Me and the Boys," playing a very arresting policewoman. ABC.
* "Frasier" (9-9:30 p.m., Channel 11) -- Shannon Tweed, star of Cinemax's tepid "Hot Line" and a series of straight-to-video erotic thrillers, guest stars tonight as Dr. Honey Snow, a pop psychologist who pops into Seattle and is forward enough to charm Frasier (Kelsey Grammer) into writing a foreword for her new book. NBC.
* "Home Improvement" (9-9:30 p.m., Channel 2) -- The central dilemma tonight is caused by Tim's latest home improvement: a basement dance floor that becomes hazardous thanks to that dreaded curse known as waxy yellow buildup. Tim Allen stars. ABC.
* "Between Love and Honor" (9-11 p.m., Channel 13) -- Grant Show of "Melrose Place," another leading man on the Fox network, is showcased tonight as well -- but this time on CBS, in a new telemovie co-starring Maria Pitillo and Robert Loggia. CBS.
* "Sports Illustrated Swimsuit Special: Class of '95" (10-11 p.m., Channel 11) -- This one-hour unofficial commercial is interrupted, on occasion, by some official commercials. If your desire for ogling outweighs your distaste for blatant promotion, this may be the show for you. Suit yourself. NBC.
* "NYPD Blue" (10-11 p.m., Channel 2) -- Two interesting faces pop up on "NYPD Blue" tonight. One is Anthony Michael Hall, who's grown up a bit since starring in the 1985 film "Weird Science." The other is Kavi Raz, who hasn't been seen much on American TV since he played the anesthesiologist on "St. Elsewhere." ABC.