Having responsibility gives men purpose. Having children gives women purpose. Lessons that should be taught not left to learning by experience. If left to experience, many don't learn it.
People need to feel like their life has meaning and purpose. Those can be found many different ways. However, having and raising a family is one way the majority of people in the world find meaning and purpose. My phrasing was purposeful.
The leading cause of suicide is depression. Childless women are 46% more likely to be depressed. Women are twice as likely to have depression than men. So, that puts childless women at a significantly higher risk of suicide than childless men. Men seem to have more paths to find purpose in life than having a family.
That said, having a family for both men and women is more likely to give both meaning and purpose to their lives. It also gives them both opportunity to not be lonely later in life.