I completely agree and identify with that. I have to admit some things about myself.
1. I hold my husband to unrealistic standards. I do not want my husband having lustful thoughts about another woman. When confronted with images on TV that I cannot compete with by today's standards of sexual desirability, I shrink inwardly. Most often, my husband is extremely sensitive and will change the channel until the scene has passed. Other times, I'll just quietly walk out of the room to get a drink or visit the bathroom until the coast is once again clear.
2. The reason I attempt to hold my husband to these unreasonable demands is completely out of fear.... and need. In order to ... ahem...enjoy myself... sexually....

<<fans face to try and keep the blushing at bay>> I need to feel sexy and desirable. If I know that my husband is fantasizing about someone else, then well quite bluntly, my ego is shot and I'd not be able to think of myself in those terms. Although physically, since I'm a woman, the act would still be possible... if I were a man I would be flaccid. (Again to put it quite bluntly,

but I'm just trying to put it in terms everyone hopefully understands.)
3. My needs and demands are quite selfish. After all, the poor guy is human. But it's something I am not at all prepared to acquiesce on.
4. It will, every single year that passes, be more and more difficult. And by the time I'm 80, I have no idea how I will be handling it. I mean... I've been a master of delusion most of my life.... but at 80... well, THAT would be QUITE a feat. My only hope could possibly be to become senile yet satisfied. LOL
5. I cannot believe I just shared that with everyone whilst completely sober!