Keep in mind the kids come first. Everyone else comes second.
That means that making the kids suffer because the mother slept around is the wrong answer.
No. I come first. Then my kids - (...)
I seriously doubt you have kids. and if so, I feel really sorry for them.
I don't see how somebody who didn't put themselves and their own development (economical, emotional, intellectual, spiritual) first would raise children. Such a person would have nothing to offer to their offspring and just propagate problems through generations instead of making improvements.
You appear to like thinking in absolutes. Life doesn't work that way. If your small kid is sick and crying in the night, will you offer up your hours of sleep for him/her? There are moments when there is a tradeoff between what is best for you personally, and what is best for them.
I understand very well how life works. And making sure that I put myself in the best position that I possibly could from the above mentioned perspectives ensures that my children will be significantly better off than the children of somebody who chose to play along with their peers instead.
Do I have to argue out how being emotionally stable, intellectually honest, and financially independent are traits that would be beneficial for any child's parents to have?