The serial dater acts like dating is his job. Apparently online dating sites are chock full of these peeps. I wouldn't know; I was too busy seeking these guys out in real life. I like to refer to it as The Dark Period Called My Twenties. Serial daters are never ready to settle down. They like the chase, and once they have you in their web (or bed), then BAM, they're out like proverbial trout.