It's an idiom, and it has this structure:
It takes [noun] to [verb]
"It takes something" in this construction means the same as "something is required". Your sentence means that in order for a man to become really keen, "the West" is required.
It takes courage to say "no". (In order to be able to say "no", you must have courage.)
It takes a few minutes to fry an egg. (In order to fry an egg, you need a few minutes' time.)
When I was at school, if somebody insulted you, for example by calling you an idiot, you could respond: "It takes one to know one." That means: "If I am an idiot, then the only reason you know this is because you are also an idiot."
Student or Learner