Two men and women who already have families, once they have had a physical relationship, can things go back to how they were before?

The answer is actually quite realistic; in most cases, it's very difficult to completely go back.
Not because the two people don't want to, but because once they've experienced that level of intimacy, many things have already changed.
Some relationships, once crossed the line, are no longer in their original place.
From an ordinary relationship, to developing emotions, to forming a deeper connection, the process itself will change how the two interact.
Surface appearances can be restored, but it's hard for the heart to return to the starting point.
1. The way of interacting will change, even if you deliberately pretend nothing happened
Many people will try to "act as if nothing happened," continue chatting and interacting as before, but few truly succeed.
Because after experiencing it, each other's perceptions have already changed.
You will pay more attention to some details of the other person, and their attitude changes will be more easily amplified.
Even if not spoken aloud, these changes will exist.
Sometimes a simple sentence can be given more meaning, and this feeling is very hard to completely disappear.
2. Emotions will intervene, and the relationship is no longer pure
Before crossing the line, the relationship can be relaxed and burden-free.
But once it changes, emotions will start to come into play, with expectations, concerns, and possibly anxiety.
Once emotions are involved in the relationship, it's very difficult to return to a simple state.
You may start to care about the other's response, and also care about their attitude towards you; this concern will make the relationship more complicated.
3. Comparisons will arise, affecting the original stability
After experiencing another state, people are very prone to compare.
It's not necessarily about thinking one side is better, but such comparisons can cause fluctuations in what was originally a stable relationship.
With comparisons, it's very hard to be completely unaffected.
These changes can sometimes be subtle, but over the long term, they will influence a person's judgment and emotions.
4. Even after separation, it's easy to keep recalling
Many people choose to end the relationship, hoping everything will return to normal.
But the reality is, even if they no longer contact each other, that experience will linger in their memory for a while.
It's not that they can't let go of the person, but that experience is hard to fade immediately.
Sometimes certain scenes or emotions will remind people of that relationship, which is why many go through a period of repeated thoughts.
On the surface, the relationship can seem to recover, such as no longer contacting or interacting, but the inner feelings are very difficult to fully reset.
People can return to their original position, but the feelings won't be completely reset.
Because the experience has already happened, perceptions have already changed, and these things won't automatically disappear with time.
In reality, some people can continue their original life and maintain their original relationship, but that is more of a superficial recovery.
It looks like they've gone back, but in fact, they just haven't continued, not that nothing happened.
Inner changes will exist in different ways; some people will gradually digest them, others will leave an impact.
This is why many people seem to recover normally on the surface, but internally, they are no longer the same as in the past.