Valentine's Day

Valentine's Day is the Feast of Saint Valentine.

History
On Valentine's Day, Lisa takes pity on Ralph and gives him a valentine when she sees that he hasn't received any. But Ralph reads too much into Lisa's gesture and, much to Lisa's dismay, relentlessly pursues her.

After Manjula discovered that working 18 hours a day including weekends was not how Americans worked, she got mad at Apu, since she thought he didn't want to see her. He could compensate this with seven surprises for Manjula before Valentine's Day.

Marge has said at sure hate to get a dozen Crapweeds for Valentine's Day. I'd rather have candy.

On Valentine's Day, Homer wants to have sex with Marge but she is too tired for it, which disappoints Homer, who dejectedly leaves the house.

Homer and Marge are about to “snuggle” in their room when Gil interrupts them and it turns out he has eating Homer's present, a box of chocolate.

After spending another Valentine’s Day alone, Moe attends a seminar led by Dr. Kissingher in the hopes of gaining more confidence with women.

Bart and Homer was having fun on Valentine's Day meanwhile Marge was out with Lisa.

One episode of Firstline was called Valentine's day and was about that never had many valentine letters.

Lisa thinks the Valentine's Day stinks, everyone has a valentine execept her. But when she opens her locker, she finds a love letter to her. She decides to find out who it is.

Non-canon
The Simpson family was visiting a theme park under Valentine's Day. When Marge and Homer was stuck in the tunnel of love started they telling about love stories.