After reading NTMIW's last post, it appears that his wife initially liked him because he was more "vigorous" in bed and wasn't a quick trigger on the gun kind of guy. NTMIW, I'm not sure when your wife's preferred method of sexual activity really changed but I'm guessing after what 7 or 8 years of marriage? Perhaps earlier if you have children. Kids have a wonderful way of taking the romance and lust out of a marriage unless a couple really works at it. So does life, being married a long time, health issues, etc. It can almost become a chore for women if they are tired from whatever has drained them that day.
Again, being brutally honest, NTMIW, and I'm speaking from not only my own experience but from many conversations over the years with other long-term married females, here's my take on your situation after reading your last post:
Your marriage sounds like a classic "been married for a long time, too familiar, built-up resentment, bored with it all, and menopausal-fueled issues" kind of marriage. We see it all the time - both here and all around us when we talk to friends, etc. I'm right in the middle of one myself. So, yours is really no different than many of them, except your wife grew so bored and resentful she had an affair. That shit is TOTALLY on her!! Not you!
Time takes it's toll on a marriage, a body, and a mind. What's the old saying, "Familiarity breeds contempt?" Yeah, that's where a lot of people get to in marriage. That's why there is also the old, dreaded "7 year itch" phrase. Long about year 7, that old way of having sex is becoming boring as Hell if we haven't spiced it up and worked at it. Plus, add in jobs and kids and pretty soon who has time or energy for prolonged sexual escapades? It almost becomes a "hurry the fuck up and get off of me" experience for many women. One of my very good, very religious friends said to me and some other friends one time, "Jim is a like a damned kid. He wants it all the time. Sometimes I feel like saying, 'Just do it and pull my nightgown down when you're done.'" We all busted a gut laughing over that because we got it.
Where your marriage derailed is it appears your wife, like virtually all WSs, didn't come to you and truly discuss it with you. She didn't tell you she was bored with the same old routine. She didn't tell you that her body took longer to respond; that perhaps she was angry with you and held resentment over things and therefore just wasn't getting hot and wet for you anymore. Whatever the issue was, she simply didn't come to discuss it with you. Why?
Honestly, most men just can't handle that shit!! It's like we've taken a knife directly to their manhood and told them they're the lousiest damned lover EVER!! It's not what we're saying but it's how it's taken. I had a friend tell me that one time, her husband started kissing her during lovemaking in a much different way and she hated it. She knew better to than to tell him she hated it so, she tried saying it turned her on when he kissed her like "this" and tried to show him. He fucking got pissed; lost his hard on, jumped up out of bed, and stomped out of the room. She followed him, trying to explain she was telling him what turned her on (instead of telling him the way he was kissing her was grossing her out) and he shut her ass down. Said he wasn't in the mood anymore. Didn't have sex with her for a month. Seriously?? WTF?? But, THAT behavior is what women are often afraid of! We're afraid of butchering a man's self esteem by doing what he considers criticizing his method of lovemaking.
Truthfully, sex is the most important thing in a man's life. My therapist talked to me about that and I've read several books that confirm that theory. A man's whole damned identity is wrapped up in how he is perceived sexually, so any negative critique of it literally throws a man's ego into a tailspin. Oh Hell, we can lie all day long and tell them they are the greatest lover ever and they'll eat that shit up. They might know they aren't and secretly acknowledge it themselves, but a woman had better NEVER remotely indicate that a man is lacking in bed. Game over if she does.
So, we suffer in silence if our husbands aren't open to discussing what pleases us, trying to do what is expected of us, faking our way through it with lots of "Oh yeah! That feels good! Oh yeah, Baby - you're the best ever" shit. All the while we're mentally thinking, "Hurry the fuck up and get off of me." Or we just shut down sex completely. THIS is where marriages fall apart.
People get caught in some downward spiral. Men know when their wives are putting out simply to please them. It injures their egos and all of a sudden another woman starts looking good to them; whether she's a downgrade from their wives or not. The AP strokes their ego and gets them to feeling good about themselves sexually again - she gets their motor running. Pretty soon, the husband thinks she's the most beautiful woman in the world and will throw every damned thing away just to keep that ego stroke going.
WARNING: Below is a bit sexually graphic
Women are no different really. We're just as vulnerable. We're more emotional and if we feel emotionally fulfilled, we'll feel sexually willing and ready. If we are bored with sex with our husband and we feel like he's not meeting our needs emotionally and sexually, we're like a damned powder keg waiting to get lit off. A guy starts paying compliments to us, flirting with us, making a little move on us and BAM, the panties are wet, we can't stop thinking about him, and pretty soon we're fucking him in a way we haven't fucked since we first met our husband. Perhaps even more experimental because we are so starved for emotional and sexual completion and wrapped up in a new lover's moves that we'll do things with him we would NEVER do with our husbands. We might never entertain the thought of anal sex with our husband, but that new guy? Oh Hell we are so hot, we're begging him to do it because he's new and exciting and the high is so great we just abandon ourselves to it. And when we are caught cheating and our husbands find out just how wild and hot we were with the lover, he is destroyed because that is a direct assault on his own manhood.
I'm not saying all men and women cheat because they don't. But, we are all susceptible to cheating if the circumstances are just right. Every one of us can say we would NEVER do that and some of us wouldn't but in my opinion, everyone is susceptible. If a person is broken enough the chances are high. There is no excuse for it - NONE! Not ever! No matter what is going on in a marriage/relationship, cheating should never be an option. But, unfortunately, it's a fact of life for many people.
Cheating - emotional and/or sexual is a horrible, horrible thing to do to a person. That betrayal will cause more damage to the betrayed than anyone can ever imagine. BSs here know that pain. It is so bad it takes us into dark places in ourselves we never knew existed. It takes the very breath away from us, causing us to stagger and fall to our knees, questioning everything we've ever believed in. We consider doing things we would never consider doing otherwise. It literally destroys us and it's at the hands of the person we trusted most. How do we ever recover from that? I sure as Hell don't know the answer. 5 years out from my husband's affair and I still look around asking myself how the Hell do I move forward.
NTMIW, you have a choice to make - stay or go. Decide if your wife is truly reconciliation material. Decide if you can live with what she has done; if you can work together to recreate some semblance of a marriage that allows you to stay together happily or at least content. But, life is short and it goes by faster every day. Don't waste the rest of your life on a woman that isn't interested in trying to heal all the hurt she's caused.
Your wife owes you most everything for you even considering to stay with her. She should be doing everything within her power to help you heal. Honestly, it doesn't sound like she's willing to do that. She flirts with other men, crossing boundaries you have established, and in general has been just freezing you out. The future with her doesn't sound optimistic in my opinion.
In addition, you have to want to heal. You can stay and keep punishing her in the bedroom. You can stay angry and let it eat you alive. You can keep the status quo and eventually end up having an affair yourself where you sacrifice your self-respect and cause a whole other shit storm around you. You can stay and truly work at healing the marriage IF she is willing to do the work. Or you can get out and start your life over, perhaps eventually with someone new. But, if that becomes your choice, just realize that down the line you are going to be facing the same sort of issues of boredom, resentfulness, menopause, etc. that have most likely haunted your current marriage. However, hopefully you will take that new found knowledge about the pitfalls of complacency in a marriage and make sure you that whomever you end up with knows that is not acceptable to you in marriage.