In the past, marriage was a necessity, so many people got married. As a result, children were born into the family after having sex. At that time, birth control methods were not widely available. But nowadays, under the concept of living together, people engage in sexual activities even without marriage, and there is no effort to have children because there is lust, not love. Now, because birth control methods are widely available, this situation has arisen because women only expect their own pleasure instead of children.