So...
The wife can't deal with her emotions getting fired up.
And the husband needs his emotions fired up.
On the face of it, that's a tad problematical. Talk about incompatible personalities.
In regard to the glasses getting steamed up and his needing to take them off so he can see and her not dealing with that because she gets all fired up looking at him without his glasses?
Since I wear glasses, I totally understand his situation.
Can she deal with looking at him with glasses that don't have any lenses in them, ie empty frames?
If she can, that's a fairly simple fix. Empty frames don't cost all that much if you aren't going for designer labels.
Except... I always took my glasses off because they get knocked about and in the way if you get your face as close to someone as you really should during certain activities.
Also, make sure you use plenty of lube if she doesn't want her emotions fired up before you get started, or it's going to be very painful, as she isn't going to be naturally lubricated.
Sure hope she can deal with her emotions getting fired up after they get down to it, or it's never going to be pleasant for her.
And since he actually does care for her, that means he isn't going to enjoy it once he really catches on if she keeps her emotions clamped down during the act.
Ahem.
Not being willing to take her by force, to rape her, does NOT make him a eunuch or a wimp, OK?
A certain level of sensitivity is a good thing in a relationship.
That said, if you are one who does have some sensitivity, you'll be looking for indicators that she isn't going to be giving off since she doesn't deal well with her emotions.
And attempting to establish a romantic moment will backfire so long as she doesn't want to be emotional.
The unrealistic bit is how in the hell they actually got together in regard to marriage; it had to be as a result of her cold bloodedly deciding that he was someone she could live with, if she's been clamping down on her emotions all this time. Since she's known him since they were children she's comfortable in his presence. And I guess she decided that getting married was what should occur at this stage in her life. Since it's not coded tragedy, but rather comedy, this aspect is not going to be dealt with realistically.
I suspect you can all tell just which person I sympathize with in this manga...
I do feel sorry for her, but at a fundamental level she's the one who needs to change. If she's not willing to do so, get the hell out of that marriage and move as far apart as possible!