Anyway, researchers at SUNY Stonybrook threw some people in a scanner and found that when shown pictures of their significant others, they elicited similar brain activation patterns as drug addicts craving their fix.
Oh, and Oxytocin, the neurochemical that is associated with feelings of intimacy and love? Yeah, apparently it's also responsible for your attitudes toward "outgroups" in your world. So essentially, love makes you act like a racist heroin addict.
Enjoy that sentiment lovebirds.