@boomerang,
I think timing matters re: piercing + sports. We timed sozlet's so she had a good four months before she had a sport where she had to take them out. (This was pre-basketball.)
Then she was fine. A bit of a hassle, not nothing, but fine.
The problem is when you have to take them out for a sport before they're ready. (I think the usual cut-off is at least 6 weeks, with 8 weeks recommended.)
Meanwhile, what's Mr. B's current thinking?
I can think of many possible reasons why he's opposed, but who knows which one actually applies to him.
If he's having a hard time articulating why, maybe just ask him if there are any circumstances under which he'd say "yes," and what they would be.
From what you've said so far it sounds like maybe it's the ongoingness of it that's the issue, the meta stuff about asking for this, maybe even more than the pierced ears themselves. I know that happens to me, I just don't like the way sozlet asks for something and I say no for that reason.