They can not tempt him beyond the boat as he was tied to his mast.
Odysseus smeared wax in his men's ears to protect them from the enchanting song of the Sirens. The Sirens lured sailors to their doom with their beautiful voices, causing them to steer their ships toward dangerous rocks. By blocking his men's hearing, Odysseus ensured they would not be tempted, allowing them to safely pass the Sirens while he, curious to hear their song, had himself tied to the mast of the ship.
So he wouldn't be tempted by the Sirens' song.
the sweet songs of the sirens lead their men to death
Yes; the Sirens sang their enchanted song, and attempted to lure Odysseus and his men to their doom.
Odysseus did not plug his ears from the Sirens because he wanted to hear their enchanting song. However, he had his men tie him to the mast of the ship so that he could listen without being tempted to steer the ship towards the dangerous rocks where the Sirens dwelled.
Odysseus chooses to protect himself from the sirens by having his men tie him securely to the mast so he can hear their enchanting song without succumbing to its effects. This is different from how he protects his men, who he orders to plug their ears with beeswax to avoid hearing the sirens' song and being lured to their deaths. Odysseus knows he is curious and will be tempted by the sirens' song, so he takes measures to ensure his own safety while also safeguarding his crew.
The sirens are a danger that Odysseus and his men must pass to return home.
These was the Sirens.
They plugged their ears with wax
The possibility of not going home.
Odysseus had the men stuff their ears with wax so they could not hear. He ordered the men to tie him up to the mast, and not release him until he stopped struggling. In this way, Odysseus acted as a signal showing the men when they were a safe distance past the sirens.
Odysseus listens to the Sirens' song safely by having his crew tie him to the mast of the ship so he cannot jump overboard, and by having his crew plug their ears with beeswax so they cannot hear the song and be tempted. This way, Odysseus can hear the Sirens' song without being lured to his death by its enchanting sound.