If you have a son in his early teens, it is likely that he has experienced a wet dream, or also called a nocturnal emission.
I am looking for more and more ways to teach our sons about their body. Although the changes during puberty are equally as important to a boy as they are to a girl, it seems that there is not the same emphasis on making sure they are informed.
If your son attended a school-sponsored sexual education presentation in the last couple of months, use what he heard to make sure he understood what was said.
Your adolescent son has maybe questioned in his own mind what happens to a girl each month that results in a period. He sees feminine hygiene ads, hears girls talking about their periods, and he has probably noticed changes in you during the month. It is unlikely that he will ask about it, but if some information came his way, he would appreciate it.