Hmm. I'm going to ponder that, the desire to be part of something.
Well, think of what is the usual reaction to a person stating that they are a loner, and/or don't want any children: I'd feel safe betting the first thing out of another's mouth would be, "Why?"
What's funny, too (not the haha kind) is how if a person is not in a relationship and offers some insight to one in a relationship, that is usally the first thing brought to light. "How do you know? You don't even have a man!" Now that's just plain silly.