While I do think you're being a bit rude about the whole thing, you may not be too far off the mark with Faust. He does have a modicum of self respect, but it is completely overshadowed by his respect for his mother and his duty to his people (also his religion but that comes later). He will pretty much do anything for those two things. So while he does think Astarte and the Queen are sexy, he doesn't hesitate when it comes to protecting the two motivating factors in his life.
If Astarte, Anastasia, the Queen, or any other noble of higher standing than him tried to actually force herself on him and bear children, he'd stop them. A little grab fanny to keep an incredibly powerful Duke on his good side and out of his bed chambers. Telling her off or worse, assaulting her, would probably get him killed, his lands seized, and the rumors about him and his mother canonized by the government. The easiest he'd get off would result in cutting off a huge line of support for his people should they ever be invaded (as a reminder, his lands sit on the border).
Forgot to reply to this one,
I overall agree with what you're saying, but all things considered, you have to agree that there's realistically a better way to handle the situation of "getting publicly molested" than: "just take it". In the manga, we also saw that Faust was genuinely going to agree to the Duke's advances, but was interrupted before they could proceed.
So overall:
1. if Faust was truly extremely devoted to only his home and country, he'd have no reason to NOT flatly reject the duke and throw her hand off. If there's a "power difference between their positions", there's also a massive breach of conduct for her to grab his arse, that makes it socially acceptable to maneuver around it (and we also do not expect the duke to retaliate, they're "buddies".)
2. If Faust, however, is willing to compromise and have sex / whatever with them (as shown, he is barely holding it in), he does not need to "take it". The big strong and respected war hero of the entire nation, can still have the capacity to make it so they'd meet in private. It cannot even start rumors, they're notorious "war buddies". The only problem is the Duke publicly declaring she'd jump his dick whenever possible, if anything -- but Faust himself still has the option to get his ass grabbed IN PRIVATE, and arrange for it.
Points (1)+(2) brings us to believe that the situation, as-is, is simply because the author wants it to be this way.
Aiight, I've argued this point long enough, jesus christ, I've got things to do <_>
