The author used the book name to make a connection between porn addiction and an old story about hunting wolves by using a blood-tipped blade for a bait.
"Basically they would leave a sharp object (like a knife) up in the ice, cover it in blood and leave it for a few days... A wolf would come, smell the blood, lick it (love it) and keep licking until it bleeds out.
A rather gruesome fable sure, but the idea is that sometimes we as people consume things that we think give us pleasure when in fact they can actually hurt us."
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I came with this concept, where the blood stain on the tip of the blade is shaped as a naked woman having a "good time".
The main idea is that the (naked) girl represents the blood (bait) on the metaphorical porn knife for the men to "lick to their death"
I also chose a deep pink color rather than red color for the blood so it has a bit less aggressive tone and more passion/porn related feel.