Love makes the TV story line go round.

Without it, the pretty interns would be stuck just treating patients on “Grey’s Anatomy.” “The Office” would be a savage satire without any heart.

In honor of Valentine’s Day, consider a few top TV couples:

[…]

[*]Sara and Grissom on CBS’ “CSI: Crime Scene Investigation” (Thursday at 9 p.m. on WBZ, Ch. 4): It’s a little awkward. Grissom (William Petersen) and Sara’s (Jorja Fox) relationship was a secret even to the show’s fans until last season’s kimono-wearing final moments. Then he ups and goes on a sabbatical and mails her a cocoon (nothing says “I love you” like insect larvae) and writes a letter that he never sends. She seems unhappy with his taciturn style. Now that Grissom is back in Las Vegas, will he finally be able to tell Sara how he feels? And if he does, will fans even hear about it?

[…]