Give her a ring, then do your thing.
Giving her a ring will not guarantee sex—it will make it guarantee it less...obvisiously never been married. I learned sex the old fashion way-—from my brother and from the street...
“You mean, it doesn’t matter that I call them in the morning?”
“Nah...they like it like that too...let me tell you about the walk of shame...something men never have to do.”
The only problem with teaching sex in school is that a)you are always stuck in the class with kids who have behavioral problems or the teacher is a child molester.