If I'm upset or angry with my husband, I may not want to have
sex wtih him, but I would never purposely withold it as a form
of punishment.

I'm assuming we are all in adult relationships here. I don't
think there's room for punishment of any kind in adult
relationships (unless that's what you're into of course).
It's not my job or my responsibiltity to punish other adult.

Punishing by witholding sex isn't making your partner responsible
for why he/she is upsetting you.

I agree with Prophet Reality................

TALK ABOUT IT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

If nothing else, you both know where you stand afterwards, and
you always have make-up sex to look forward to !!!!!!!!!!!!

You see where my mind is these days : )