Would have been able to go to sleep sooner if I had just gone along with it

I have a legitimate question towards the insight you've shared because maybe you can help me better understand my current situation. As a 31 year old woman who has been with my (now) husband for 16 years (married 8), I've found myself in a situation where I'm the one constantly getting denied or having to 'beg' or pressure him into sex. We had a very healthy, happy sex life. Usually am average of 4-5 times a week for years. Then it just stopped. I feel like I'm possibly making it worse by pointing it out to him a lot but it's very frustrating not to understand. I'm really trying hard not to act like a crazy bitch about it but it's been going on for SEVERAL months now. I'm so confused by it that I sit and overanalyze it wondering if I did something wrong, did I get too chubby, am I no longer attractive to him, etc. I do not believe that he would cheat on me. I'd like to think everyone believes a relationship so long would be the same. I pretty well enjoy sex and I think that I actually identify slightly more towards the physical side than the emotional. I would love to enjoy sex everyday but anymore I'm lucky if it's every two weeks. Most of the time I feel like shit because I feel like the only reason it happened is because I pressured with guilt about how long it's been. And of course, when I bring it up as a concern he says "nothing is wrong. We have sex". He's got actual friends who have shambled marriage because the husband wasn't getting any from the wife and got busted with a prostitute. I'm willing and ready to go anytime. I read all this stuff about men who get denied, especially married men, and how hard it is for them. I'm completely the opposite of a sexually neglectful wife and on the contrary, I feel that I'm on the receiving end of this usually male stereotype dilemma. It's been affecting me emotionally as well as I feel down and depressed about it all the time. I am so confused. Any insight is helpful from either perspective.

-The only thing that changed for us majorly this year is him having a vasectomy in January. We have none and do not want children and it was a mutual decision. Everything continued back to normal after he healed from surgery, nothing was different or weird afterwards with sex then. It was like nothing happened to his "stuff". The sudden "cessation" started around mid-May.

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