[demecleze]

First one.

I would assume that priests keep this directive with high fidelity because it is the word of God.

[eastsider]

Correct me if I'm wrong, but the bell curves of sex described in post #4 appear to illustrate the model of sex as a continuum, not a dichotomy. By rejecting the male-female dichotomy, the continuum model doesn't explain the why of the exclusively male priesthood; it explains it away.