Or I can tell my anxiety to get the hell out and fall asleep knowing that I can trust nothing but my gut. Hoping that my gut is trustworthy enough to steer me in the right direction so I will wake up alive the next morning. While also hoping that if he is in fact an ax murderer that the ax is sharp enough that death is swift and painless.
I love this analogy because, much like my internal conflict, the price for "getting it wrong" is so high (cut up into little pieces) AND the payoff for "getting it right" is equally high (stay married to a loving, non-ax murdering man/woman). But the complication in an A is, as I'm sure you probably thought yourself, you KNOW the person laying next to you is an ax murder. You caught them sharpening the ax and taking test swings at your side of the bed. In fact, they actually hit you and gravely injured as you slept at least one time (D-day) and sometimes more (for those who've had multiple d-days). So it's a bit more difficult, you know this person has an "ax fetish", you know they keep it sharpened up and under the bed, and they've actually tried to chop you up with an ax at least once. So now, to sleep soundly, you need overwhelming proof that this person is, in fact, not going to try to chop you up while you count sheep.
IMO, it all comes down to desire and motivation. When people really want something, they do whatever it takes to get it.
What do we hear from most of the WW as to why they cheated. That they gave sex in order to get feelings and attention in return. They really wanted something, and did what it took to get it.
And that's where we can loop this succinct gem into the conversation. Because if your husband, who's already taken a swing at you with an ax is still sleeping with that ax in his hand, well.. You have every reason to be concerned. If, however, he does "whatever it takes" (throws the ax away, handcuffs himself to the bed to sleep, whatever) you will start to build some trust that this guy is a changed individual. You can sleep with some level of security and comfort because you can see, even though they tried to chop you up once, that's not who they are today and they are doing "whatever it takes" to show you they've changed.
And, stepping away from the ax for a moment, I think the "whatever it takes" thing is really what I, and lots of other BS's want to see. No, I don't want my wife to cut off her hand for me. Yes, I do want to see her put MORE effort into our relationship than she put into the A. A's are a ton of "work". You have to spend countless hours looking for an AP. Then you have to groom one another. Then you have to find time. Then you have to find a place to meet. Then you have to get condoms (or not), hotels (or parking spots), put on your good underwear, shave, put on your perfume/cologne, pick out your sexy clothes.. Then you have to actually go and have sex. Then you have to clean up from that sex and go back home, act like everything is fine until you sneak off to the bathroom to make sure your AP made it home OK.
Tons of work and effort required, FAR more effort than having sex with your spouse, or sending your spouse a love letter/flowers or finding them a good gift. Or telling them how special they are to you.
Now, when you turn around after d-day and your spouse is requesting "similar treatment", be that sexual, emotional, financial or anything else you do some mental calculus, how much effort will that thing be (and whatever this number is, it is, by rule, LOWER than the effort was to do that same thing for the AP because you don't need to steal time, find a place, sneak around, etc) and how much pleasure will I get or bring to my partner doing that thing?
So, when you apply that to the same sexual act and wind up at two different conclusions (yes, I'd love to go down on my AP, but no, I will not go down on my W) there's something not right somewhere in the equation. Because the effort to do "kinky things" with your spouse is ALWAYS lower than the effort to do that same kinky thing (or, in fact, even the effort to just have an A, IMHO) with the AP. It's a lot easier to have anal sex at home, with lube, time and a loving partner you trust than it is to "stick it in dry" in the backseat of a car in a grocery store parking lot with some guy you started "dating" a week ago. And yet this happens, quite often; if you look at it in the equation I just proposed, A's often go from effort level 0 to effort level 1000 (sex that would make a porn star blush, prose that would make Shakespeare jealous, gifts that rival the Hope diamond, etc) in the blink of an eye.
They did what was required to get the feelings. I get it, but "getting those feelings" required dramatically more effort, engagement, planning and just summarizing, "work" than doing any of those things would require in the marriage. So, what does that tell you? One of two things, either those feelings were so much better, so much more "worth it" that it wasn't hard to put in the "extra work". Or, you (BS) cannot create those same feelings, so, while the feelings are "worth it" for the work, no matter how much "work" they put in with you, they're not going to feel as good as they did with the AP, so.. No backseat anal for you, because you simply cannot make me feel as good as the AP did, ergo, you are not worth it.
Will the WS put the same level of effort and desire to save the marriage that they did to destroy it?
I think the answer is usually "no, they will not" and the reason is what I stated above, "the marriage is not worth as much as the A was". I'm pretty convinced that is my W put the "same effort" into our R that she did the A, there's no way I'd ever consider D. In fact, I'd go so far as to say I think R statistics would be much different if most WS's put the same effort into R that they did the A.
I hate doing this to her, hopefully she won't mind, but I often look at a poster like Hikingout and think to myself, "what are the chances that she make it in R". Because she's here, day after day, working her ass off to find her inner truth. I'm sure, like me, she spends hours a day working on it, thinking about it, and talking through her feelings and inner monologue. She's put 100's of X more time into her R than she put into her A. So long as the efforts that she talks about here are applied to her M, I'd give you 10-1 odds that she and her husband stay married and find happiness over the long term. Because she (and other posters, this isn't an inclusive list, is just that she and I often find ourselves debating on various topics) has put in so much MORE effort into R than she did the A. And, as a BS, that's what I want to see from my W. More work/time/effort and yes, "kinky sex" than she spent doing those things with her AP. Does her husband ask himself "am I worth it, am I worth more to Hiking than the AP"? I'm sure he does. To which she can point to 1000's of posts showing him how hard and how much she's willing to do to get better and heal their relationship.
And there are no guarantees, the best poster in the world, the hardest working WS on this site, they could still wind up D'ed. But, and this is the absolute most important thing, if they do, at least they won't look back and think "I wound up divorced because I didn't try/work at it". But that maniacal focus on "fixing it" is what I think a lot of us, certainly me, want to see from my WS. Work harder for me than you did the AP, and work in the areas that matter to me; that's how you show me that I'm "plan A".