Well, I can't seem to find the post where killabeez talked about it, but yeah, that's the idea. The clam is the guy who keeps his feelings in, and the anti-clam is the guy who wears his heart on his sleeve. Spock is the original clam, Kirk the original anti-clam.

Mmm. John Crichton. I love the way he lets it all hang out, and it's funny because I'm normally more attracted to clams.