Sincere Relationships

If we've succeeded in becoming such efficient reproductive machines--equipped with both a generous appetite for mates and a cool ability to screen them for genetic qualities--why muddy things up with romance? For one thing, we may not be able to help it. Just being attracted to someone doesn't mean that that person is attracted back, and few things drive us crazier than wanting something we may not get. Cultural customs that warn against sex on the first date may have emerged for such practical reasons as avoiding pregnancy or sexually transmitted diseases, but they're also there for tactical reasons. Males or females who volunteer their babymaking services too freely may not be offering up very valuable genes.