@bushwhacker2k Regarding the whole refusal of a hot partner, it really depends on the situation. If the people in question don't know each other well, for instance if they only just met, then why would one of them blindly accept the advances of the other solely based on their appearance? For all they know, the aggressive one is aiming for their life, mentally unstable, or has some std or other physical complication that could come to bite them later. Then there's to consider that this is all focusing on their physical appearance/ailments only. For some such a shallow reason as ""this person is hot, so I'll just accept their advances" might be fine, but for many the actually personality underneath the skin is equally important if not more so than their physical appearance. It's about personal preference and willingness to let a given person into one's life(and bed), and some are very careful who they let close for a number of reasons. At the very least, one may admit that another person is very attractive, but they may want to get to know the other person a bit more first before they accept the other person's desire for physical intimacy.
Just to be clear, I'm not refuting your point as being dumb or unimportant. It is indeed frustrating when a character in any given isekai, or any story for that matter, refuses the advances of another when it is blatantly obvious they want what is being offered, but it heavily depends on the situation and the people involved. I'm simply trying to point out that not everyone is so open about blindly accepting physical intimacy, and everyone has different thresholds that determine how far they are willing to go before things need to stop(temporarily or permanently). I, for one, would initially be a bit put off if I was in this MC's shoes due to the fact that this stranger who was just trying to kill me is suddenly trying to jump my bones. I'd mentally admit that she is attractive, sure, but I would rather get to know her first before I commit to anything, and only after I can ensure that what she is doing isn't an act to make me drop my guard so she can stab me in my sleep(regardless as to how powerful I may be). This is also assuming I am even interested in establishing such a intimate relationship with anyone at all given the circumstances. You know, given that our MC has no home, no goal(vague adventuring, I guess?), is far from home, unable to return to said home, and has no friends or family as they are all in a completely different world. It's important to establish priorities and boundaries when one is in an unfamiliar environment. Thankfully, knowing how things tend to go in situations like this, the MC likely doesn't have to worry about being stabbed in his sleep and at least he is already established as an adventurer, not to mention he is willing to call her wife despite everything so I'd say he has a fair bit more confidence/balls than most other isekai protagonists.
TL
R Everyone has different standards, and priorities are important. As is one's own well being.