One of the main reasons sex returns in a marriage, and your wife now wants to have sex multiple times a day, is it mostly due to your physical growth from the gym, your phisique change, rather than your mindset.
It's also the case why you get female attention now, in the same places you were actually 1 year ago. (Like the supermarket, grocery store, beach, etc)

Or has anyone here applied the principles without lifting and still experienced this change?

Just trying to understand.