The irresponsible pregnancy would speak for itself, it is a shame the men can stay anonymous as the shame is actually a good motivator to gain self control.
The reason I matured since being some impulsive, arrogant teen is that the shame and lack of ego associated with being a purely impulsive idiot motivated me to grow into a mature adult and even then it is a constant reminder and demotivator for me to be an impulsive anarchic fool. I am sure without laws and public opinion that we would be wild primates like chimpanzees, no order or ethics beyond compulsive ocd or impulsive empathy.
We are our rawer selves as children and teens as well as very young adults. It is the urge to be proud of who we are and ashamed of the vices we give into that pushes us to slowly and gradually mature constantly until we hit that age when very elderly where we again stop giving a fuck.
Condoms only fail if ripped, logically. Which partner ripped it or was the product manufactures subpar to be sold? If it was a size thing, I maybe somewhat get it but really to kill a human solves very little of your issues as a man ir woman.