Love apparently took a wrong turn over the St. Valentine's Day weekend: The three most popular video rentals-Unlawful Entry, Single White Female, and the debuting Death Becomes Her-all expose the horrific side of romance. But while terror seemed to replace sweetness and schmaltz, good manners remained. Tact (who wants a gift of an exercise video from one's significant other?) and a waning of New Year's resolutions combined to drive one fitness tape from the top 10 best-sellers, leaving just the mega-popular Cindy Crawford workout, and Richard Simmons: Sweatin' to the Oldies 2, and even these slacked off this week. LAST RENTALS WEEKS ON WEEK CHART

1 2 Unlawful Entry 2 Kurt Russell (FoxVideo) 2 1 Single White Female 3 Bridget Fonda (Columbia TriStar) 3 - Death Becomes Her 1 Meryl Streep (MCA/Universal) 4 7 A Stranger Among Us 5 Melanie Griffith (Hollywood) 5 4 Boomerang 8 Eddie Murphy (Paramount) 6 3 3 Ninjas 4 Michael Treanor (Touchstone) 7 5 Raising Cain 4 John Lithgow (MCA/Universal) 8 6 Diggstown 4 James Woods (MGM/UA) 9 9 Housesitter 10 Goldie Hawn (MCA/Universal) 10 13 Sister Act 14 Whoopi Goldberg (Touchstone)

SALES

1 1 The Muppet Movie 2 Charles Durning (Jim Henson, $22.99) 2 2 Beauty And The Beast 16 Animated (Disney, $24.99) 3 4 The Great Muppet Caper 2 Charles Grodin (Jim Henson, $22.99) 4 5 101 Dalmatians 45 Animated (Disney, $24.99) 5 3 Richard Simmons: Sweatin' To The Oldies 25 Fitness (Goodtimes, $19.98) 6 10 Sister Act 14 Whoopi Goldberg (Touchstone, $19.99) 7 6 Fried Green Tomatoes 2 Jessica Tandy (MCA/Universal, $19.98) 8 31 The Rescuers Down Under 22 Animated (Disney, $24.99) 9 7 Cindy Crawford: Shape Your Body 18 Fitness (Goodtimes, $19.99) 10 38 The Great Mouse Detective 29 Animated (Disney, $24.99) For the week ending February 14