So far, not one person has responded to my legit argument against women in nuke boats. Not one person who's argued in favor of it has had time in the nuclear training pipeline, supervising and working with females in a submarine nuclear plant. So if all you've got to offer is "it's not fair", or "the USN is hidebound", please relax and enjoy the joke.
I have no doubt in my mind that women can mentally (i.e.- psychologically and IQ-wise) function in a submarine environment. I'm also certain that with a little adjusting, the men would handle it, too. But the physical capability question remains. IF the Navy would start making females take the same PFT that males do, I'd begin to reconsider. DACOWITS would pitch a fit if they did, though.
The pregnancy issue is not insignificant. Every person you lose puts one watchstation port and stbd. Not a pleasant way to spend 6 months (or even one month).