He does however enjoy a good boxing

match where two semi naked men try to beat the

out of each other-and he can’t see the hypocrisy.
It's this that makes you seem like you are baiting. It leaves me less inclined to think you are sincere, surely you can see the difference in a boxing match and posters purposely designed to border on softcore/erotica.
Unless we are talking about a particular type of boxing, this is in no way similar.
I suppose it's possible you didn't mean the nakedness of the men and were referring to delighting in violence but even mentioning their dress in the same context as your OP it is difficult to see any differently.
Those types of posters always felt like a no-go to me. Perhaps you are different but I can't see any particular reason to have one myself except that promotes good stewardship and proper outflow of one's personal energy in righteousness.
In your case since you seem to find that unattractive or at least some element of it...funneling energy gazing upon someone you can't make love with knowing they aren't real and it's just a cheap poster mass produced or even if especially made
still you can't hug it, you can't talk to it, you can only use your imagination on ONE frame. Even if, as you say, that is just to appreciate the beauty...it isn't organic. It's one still image and that would only make me lonelier and I doubt a future spouse would appreciate that.
"many" interactive frames per second with a lifelong partner? Seems a shame to waste any of them on someone you can't interact with. Some of it may be art, but putting it a bedroom would cross a personal boundary for me.
I can't think of any productive purpose. If you are sincere, my intention isn't to come across as judgemental.
There are ways to "make believe" with still images but even if it were something innocuous like a full wall landscape, I still end up getting bored. "pretending" is cool enough to know that you can, but gets dull and I find myself pushing the envelope at times in ways that just feel wasteful...much like looking in a mirror too long.