A person so attracted to pork products that they will avoid a long-waited reunion with their old high school buddies, preferring instead to stay home and 'baste' a 'ham.' The Hamsexual is usually so caught up in his pork-related fantasies that he believes them to be an adequate excuse to avoid engaging in regular social activity.
"I can't go out with you guys tonight. I'm basting a ham."
"You're a damn Hamsexual is what you are, Greg."