Wow. I can identify with your situation. We have been married more than 30 years. My wife never really opened up to sexual experimentation. She clearly likes to receive oral from me. Beyond that, she has no idea of what a good sexual relationship is. Her idea of male sexuality is what she sees in movies. She thinks that a guy can just finish on the director's cue. She just wants me to hurry up and finish after she is satisfied. More times than I care to think about, she just got tired of sex after I had satisfied her desires, would quit and leave the bed, and watch me stroke myself to a release, looking at me with disgust. She turned a beautiful aspect of life into something obscene. Sex with her was like walking through a minefield. I never knew when I would touch her in a certain way or place that would set her off in an angry, explosive outburst. I had to be really careful whenever touching or kissing her. She resisted orgasm whereas my previous women partners thanked me for my ability to give them that pleasure. Here is something interesting: Early in our relationship, she thanked me for letting her enjoy her sexuality. Judging by the R-rated movies she watches on the internet, she seems to like ...... scenes. She is harshly critical of men who look at women.
I have no doubt that she is lesbian and should have connected with a female partner. I know that she has had lesbian encounters. Yet, she is too inhibited to admit it or to pursue her true desires. I spoke with a woman who knows about one of her lesbian affairs. She said that my wife had no clue about sex or a woman's body. Seems that even with another woman, my wife is not a very enjoyable sexual partner.
The end result is that I dreaded sex with her. It was not enjoyable, and instead was very stressful. At my age (back then mid-50s), I didn't think that cheating with other women was a practical solution. So, I acted on my curiosity about bi-sex. Since then, I have had sex with men and enjoy it more than whatever I had with my current wife. She did find out about my meetings with men, and was super critical of me, yet never referred to her own lesbian pursuits. Wow, talk about double standard. She makes me appreciate my previous intimacy with women, including with my first wife, and dearly regret that things didn't work out with them.