Anyone who sincerely believes that wives bodies belong to their husbands has a serious problem. On his website Solomon has a section claiming that he doesn't condone husbands raping their wives, and that he isn't for abuse. I suspect that he is one of those people who thinks of rape as only being rape if there is violence involved.
The 'don't look at her face just in case she is grimacing and thinking just get it over with ' because that might do in your hard on/make it hard to ejaculate is really really grim.
I read the actual blog post and it is a bit more nuanced, but essentially says that if your wife doesn't enjoy sex it is essentially her fault. You aren't raping her, she is withholding on you, you should pray to god not be be a better person who doesn't want to rape his wife, but instead for her to put out willingly for you.
The advice to wives blog is I think even worse. Here is spends ages on proving that the bible says it's actually a good thing to lie, followed by saying that even if you are in pain you should allow your husband to have sex on you. T