You did note the "can" in that last sentence, right? Good. Because it's kind of important to this article. Because as sweet as Homer can be with Marge, he is also exceedingly awful at this whole romance thing.
First off we have Homer's general selfishness and insensitivity towards Marge. This usually manifests itself in simple ways on the show, usually through Homer taking a dangerous and wildly irresponsible job he is in no way qualified for in defiance of Marge.
Though truth be told, it may be for the best, because when he does remember holidays he tends to halfass things or go completely insane. In the episode "I'm With Cupid", when Apu starts outdoing all the men of Springfield at celebrating Valentines, Homer goes completely ballistic, taking on a number of destructive acts up to including crashing a plane and kidnapping Elton John, just so he won't have to look so bad for failing at romancing his wife.
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-- Matt Carter
(We know there's a lot of Matt Carter's online you could spend your time with, so thanks for hanging around this one!)