When I was in school, I lost track of the number of couples I knew who got engaged at age 16, and went right into wedding planning after graduation. And why not? Try to talk a 17 year-old out of it, and they'll tell you that of course you don't understand -- you've never felt love like this. No human has. What they and their guy or girl has is the kind of love that freaking changes the orbits of planets. In all of the universe, there has never been a love like this, so back off, old man.
And you sure as hell can't point out to the couple that their hormones will never be at these levels again. They'll think you're dismissing what they have as teenage horniness, not realizing that those hormones also mean that every emotional impulse is piped into stadium-ready stack amplifiers and cranked to Woodstock levels. You will feel that burst of adrenaline and stomach flutters when you touch their hand or just glance at them from across the room, and think, holy shit, if this isn't love, nothing is. God knows I thought that. Over and over. The songs talk about your "heart" but the feeling kind of radiates from the gut. Close enough.
Look, love is clearly located somewhere in the torso area, that's what matters.