The word you’ve probably never heard, Cathy, is “bastardy” — a condition that once carried enough social shame to keep it relatively rare.
When I worked with middle school kids a few years ago I found that the bastard to (whatever the opposite of a bastard is) ratio was about 50/50. Those kids had no idea that there was a stigma about it, and the 12-yr-old mexi moms in the schools were actually held in high esteem by their peers because they had a baby, and that was their goal in life according to their culture. They had photos of their underwight preemie babies in the Trapper Keepers and all the other mexi girls huddled around them and fawned over the photos. It sickened me.