Girls rarely have sex intending to have a child.
We had the “don’t have sex until you are married and ready for a kid” talk with my daughter early and often and are having the same discussions with our son now. This class is not a substitute for those talks, but I DO think youngsters that have responsibility for a small child see how much work it is.
I read a lot of interviews in teen magazines when I was younger and when my daughter was younger where girls said they WANTED to get pregnant and have a baby. I remember one article where three of the girls were 12-13 years old. They had no clue how much work a child is. Most kids don’t because they have not had to babysit younger siblings or relative’s kids. When they find out, they REALLY don’t want to have kids until they are older.