Can any of the Kiwi elders (
@Marvin , etc.) or new blood (
@The American Hedgehog ) describe the relationship between Bob and Barb? Was it a marriage of convenience or were they really in love? Do we know how they met? If I had to make a guess, Barb was a slutwhore who began to see her whorish life wasn't going anywhere. But then this quiet, easy going, simple minded man with a steady job came along. He was a bit lonesome -- sure, but hey he's got a steady job and a pension. To Bob, someone who seemed shy and didn't get much attention from women, he probably just appreciated Barb's company, her interest in him, the occasional blowjob.
One of the most noteworthy things that's often overlooked is that they didn't really seem to have any family friends. I think this goes a way to explain that Chris doesn't really see the need for friends. Why would you need friends when you have a sweetheart? Bob didn't need friends. Neither did Barb. As long as you have each other, right?
Edit: I'm not implying the Chandler's were anti-social. At least Bob wasn't. But still, the Chandlers didn't seem to be the type of people who had family friends, who had people over for dinner, who got invited to Christmas parties, etc. Barb I think was anti-social, but not in the traditional sense. I think she wasn't social or friendly with people only because she thinks they're trying to get something out of her.
tl;dr: Barb was just a cumwhore who latched on to Bob for his steady job, right?