I do think what CT wrote is true - that being held to a different standard long term and being felt pressure to be a certain way to be loved is not really the healthiest. Many WS have spent years and years hustling for love, learning now they must also work to be this ideal size is a recipe for disaster.
But - The truth is the WS is held under different standards for some period of time no matter what. It's just natural consequences of your actions. Maybe not specifically geared towards weight, but if you want to earn someone's trust back and restore connection, then you really do have to bring your A game...for years. There is no way to not hold them to a higher standard until they can prove themselves worthy of your trust and vulnerability. They do NEED to reach a higher standard, that's sort of the point of becoming safe.
The truth is this post started from another post in which I felt pretty sorry for the man who wrote it. Mostly because I think we are so prone to be triggered by weight issues that we can't even talk about it without taking it personally.
It's probably common that attraction is the last thing to return after infidelity. The man was trying to understand the lack of attraction was looking at the most obvious reasons it might be. That's sometimes easier, right? It's easier to say "Well if she lost weight maybe I would be more attracted to her". That is something that seems fixable/controllable (even if it's not for some people).
What's not fixable or controllable is what likely dimmed that candle to begin with. The BS who may have been more accepting of the WS prior to the marriage has now had everything called into question. We look at a question like that as shallowly as it was asked.
Being attracted to someone is a delicate state to be in, and it most certainly isn't all exterior that contributes to that. Attraction and connection in marriage are often hand and hand.
As a WS, there are many things I could do to make myself more attractive or less attractive. When I was wallowing, I was less attractive. When I was more empathetic and in tune with him I was probably more attractive. The truth is a WS could get to an ideal weight, spend all the effort and time they could on their looks, and it wouldn't necessarily restore the attraction. In fact, without any interior stuff changing it may even be a huge turn off. It's easier to point at exterior stuff because it's more obvious. Men especially are visual creatures so when attraction goes away I think that their natural instinct is to look at the externals as the problem.
It's a consequence of the cheating party's actions that their spouse does not feel connected or attracted to them. Reconciliation is a process and it's messy. R happens when both people are healed and the relationship is healed. There is far more generosity to be shown to each other as a result. We shouldn't be shaming anyone for being in the beginning or middle state and not having that generosity.
I also think that it can come down to effort. In the affair I was about 20 pounds overweight. After the affair, when I started working on self-care as part of my healing those pounds fell off without that even being the goal. The more I took care of and respected myself the more stable I was. All of these things played into reliability and consistency and honestly I think those two things are the biggest key rather than the scale.
I think we missed an opportunity to help someone uncover what was really bothering them when he really wasn't trying to be disrespectful, he was trying to solve his problem.
I think like OIN said, lots of marriages go through a period in which attraction can be lost for a period of time. Add in infidelity, and it's really no mystery how that could get very, very lost. When flashes of it return, it's scary, fight or flight comes in. You almost can be fighting against your own attraction as a protection mechanism.
I just wish when someone brings this up we could really look at some of the underlying stuff instead of shaming them. The process of R is one of self discovery for both the WS and the BS and for that each thing requires a deeper look rather than being told why it's wrong. Just my two cents.