Fair enough, I'll agree that sex isn't a right. However, if one partner in a marriage makes a unilateral decision to hugely limit (I'm thinking of the people who have sex every few months) or deny sex completely, they really shouldn't be surprised if they end up single.
One of the fundamentals of marriage is monogamy, not celibacy! If you are expecting your spouse to be monogamous, the flip side is that they can expect sex.
I'm sometimes disappointed when my DP isn't up for sex, I'll be grumpy if it has been longer than a week. That doesn't make me an awful human being, it makes me a flawed one, just like everyone else. It is fine for me to be unhappy when my relationship isn't meeting what is, for me, one of the main reasons for being in a relationship. I don't get to pressure him, be rude, or nasty, nope, but I am allowed to be unhappy about it!
Nowhere in her post does OP suggest that she is being pressured into sex by an abusive DH.