Because they are tired of paying for welfare "Fun Babies".
This and the younger men with women of.child bearing age don’t want to be hit with child payments of 25% of their pretax gross income for a hook up. Remember the younger generations don’t have the same morals and never will. Marriage is a losing net for young men the courts are packed against them. $300 for a couple of pills or 18 years of 25% of gross. At $100k per year that’s half a million not including inflation. The choice is clear for young men. Again the moral rightwing causes are not resonate with the youngsters that’s just a fact accept it or not but it doesn’t change that fact.