This question should be asked to those couples who have chosen the child-free path.
Each couple has their own story: someone tried to get pregnant for a long time and it didn't work out for them, someone went for artificial insemination, and someone gave up.
There are other couples who immediately made a decision for themselves - to live for themselves! Because it is so comfortable, so you can travel and so you can not limit your freedom and your usual rhythm of life.
Everyone is happy in their own way when they choose their own path.