Another thought I just had though - has OP even said that her DH doesn't want more children? If his sudden reluctance to wear condoms is due to the fact that he would actually like more children in the near future then I think that OP should be the person who either takes responsibility for contraception or says she is not willing to have sex unless her DH agrees to wear condoms. I think there is too much presumption that both OP and her DH are in agreement about not having any more children (not presumptions by you).
That's a great point, but from threads on here it doesn't seem to work that way, or at least it doesn't when it's the woman who wants a baby and the Dh and doesn't. Women who use withdrawal with men they know don't want children are torn new arse holes when they end up pregnant, the bloke is excused for using withdrawal even though he doesn't DC.
There's a thread a few days ago where a woman thinks she might be pregnant, their method was similar to the OPs condoms and withdrawal, the husband absolutely didn't want more DC, she wanted a third, the Dh had unprotected sex with her one night and she got pregnant, shit loads of posters gave the OP a very hard time, saying she had tricked him and called her all sorts, that she was a bitch for not using more than withdrawal when she knew her partner didn't want a a baby.
What you just described is similar, one partner not using contraceptives at all because he may want a DC, even though they know the other one doesn't. If OP got pregnant after using withdrawal I don't think people would be tearing him a new arsehole, saying he's tricked her, that's he's controlling. It would again be the woman taking the flack, she'd be called stupid for relying on withdrawal when she adamant she doesn't want DC.
But here we have a woman who knows withdrawal is risky and doesn't want to use it as contraceptive method, who also isn't insisting that he undergo hormone or surgery and she's still in the wrong for wanting him to wear a condom.
I know you didn't say this, just your last post made me think of the other active one.
Man doesn't want baby, woman does, man knowing,ya has unprotected sex and pregnancy happens = the woman fault, she's in the wrong.
Woman doesn't want baby, man does, theybuse withdrawl and woman gets pregnant = the woman's fault, she's in the wrong.
Woman doesn't want baby, man does, she doesn't wants to use condoms and she's still in the wrong,