Years ago most men felt the responsibility to marry in such situations and did. Not today. As a society we need to reverse the current trend and again raise responsible men and women.It depended. Were the man and the women members of "polite society"? Or were they "fallen" from the start?
The edges of society have always been frayed. What's happened recently is that the middle has become undone as well. There's no consistent culture or morality being passed down between generations, partly from the hippies breaking the social contract in the 60's and American business breaking the social contract(welfare capitalism) in the 70's. This has led to a culture of gratification and anxiety even among the people that should know better(the professional/middle classes).
Wish I knew an easy solution, but I don't.
Notice I said MOST. : )
Can't tell you how many discussions we've had about that topic.