Think of it like this! Love is comprised of multiple aspects. I understand the "high" feeling is just chemical, but it's still necessary for the short time it's there. That's a body part of love (eyes mostly :p ). Then, once that fades a bit (it's still there, it will ALWAYS subtly be there, but it's not so strong anymore) you're left with the other aspect of love; Devotion.
Devotion is a hard thing to come by with people! They want the high to last forever in a magnificent strength, but when it's time to commit they leave.
After the high, and willingness to devote yourself to one person (truthfully), you have sensuality. Why is this a part of love? It is the act of "expressing" it, and for another reason, in creating different type of bond. People characterise it as a "spiritual" bond, but whatever you call it, having "oneness" with someone adds more depth and meaning to your relationship. It does release a STRONG bonding chemical that aids with keeping things monogamous, but ultimately, it is a part of love.
Those three things cannot do without each other! Seriously! You can have devotion and sensuality, but if you never have the high to begin with, you're forcing something on yourself which will be emotionally and mentally tormenting - I've been there.
Likewise, if you don't have devotion, you become like some of these SW perves! That's not a good place to be either!
So, you don't want half a cat, but the whole cat. Love is multifaceted and one without the other, as I mentioned, is complete torment!
