It took time for men to recognize that they did not have to promise marriage in the event of a pregnancy in exchange for sexual relations.
Men didn't always know that they didn't have to tell women they'd marry them if they got them pregnant in order to have sex with them.
The car companies also hope to convince NHTSA that slower-inflating air bags would provide almost as much protection and far less risk than posed by the current standard--as long as seat belts are also worn.