Well, we receive education regarding this subject where we are about 10 in our school system.
Some year later our teacher send us home to watch
the Blue Lagoon because she suspected that some were slow learners. For some reasons it did not result in Teenage pregnancies. Looking back I can remember only one, who got pregnant before the age of 20.
Regard sizes of Condons I know that Kenya returned some to Sweden that they had got through a aid program because they claimed that they were too small. I reminds me of another story in my youth where I visited a naturist camp. Minding my own business and reading a book on the beach, I overheard a conversation between two fathers and their sons. (Laptops and Internet wasn't around at that time).
The pale family was walking along the water when son asked it he could hold his fathers member when they walked. It was OK for the father. The son in other family which had a somewhat darker skin noticed that and asked his whether it was OK to do the same thing. The father replied that it was OK with him but he should go too far away so he risked getting lost.