Why does Odysseus respond when he hears the siren's voices?

Basically, Homer is just a story teller who tell great stories like Odysseus. It was said that sirens have lovely voices but could lured whoever hear their voice to destruction. A mortal is said to be natural of being curious of almost anything, and Odysseus is no different. Odysseus is known to be a man of wit, so, when they are crossing the path where Sirens are, he didn't put an ear wax, instead he commanded his crew to strongly bind him on their post so that he wouldn't do anything that would lead him to his destruction. It was said, that only Odysseus is the man who lives and hears the sirens' song.