This may reflect the fact that in some of those countries the number of people having their first sexual experience before the age of15 also declined, and that even the precocious seem to be using condoms more frequently.

• 这些同时折射出那些国家中的其中一些，其公民15岁之前就有了第一次性行为的人数也在下降，并且那些早熟的孩子似乎也常常使用避孕套了。