Sincere Relationships

The problem with romance is that it doesn't always deliver the goods. For all the joy it promises, it can also play us for fools, particularly when it convinces us that we've found the right person, only to upend our expectations later. Birth-control pills that mask a woman's ability to detect her mate's incompatible MHC are one way bad love can slip past our perimeters. Adrenaline is another. Any overwhelming emotional experience that ratchets up your sensory system can distort your perceptions, persuading you to take a chance on someone you should avoid.

Psychologist Arthur Aron of the State University of New York at Stony Brook says people who meet during a crisis--an emergency landing of their airplane, say--may be much more inclined to believe they've found the person meant for them. "It's not that we fall in love with such people because they're immensely attractive," he says. "It's that they seem immensely attractive because we've fallen in love with them."

If that sounds a lot like what happens when people meet and date under the regular influence of drugs or alcohol, only to sober up later and wonder what in the world they were thinking, that's because in both cases powerful chemistry is running the show. When hormones and natural opioids get activated, explains psychologist and sex researcher Jim Pfaus of Concordia University in Montreal, you start drawing connections to