Thank you! Yeah, it's never fun when people start to think their own interpretation is the only possible one.

Personally I have a hard time buying any John Sheppard who never was even so much as casually attracted to any woman, ever, but beyond that you can sell me on practically everything. I tend to see him as bi, but then I tend to see most people as bi unless they explicitly tell me otherwise. *g*

as a sort of a guy who prefers casual relationships because he fucks up the ones with people he cares about

That's an interpretation that works very well for me, no matter what orientation he is. :)