Which I would understand to mean that sex is good. It is a gift from God. It is the deepest expression of love that we have. It is also very powerful and subject to abuse. I would have a sneaking suspicion that the primary concern of your speaker was the amount of sexual activity among young people today.
Sex education is necessary.
The primary focus should be in the home and in the relationship between Mom and Dad. The church should also take responsibility for teaching responsibility. I try to do this to some extent in confirmation class. Since parents and the church have not fulfilled their responsibility in this area, and since a good deal of the information that we pick up from peers is simply wrong, the school has to assume a certain level of responsibility. When I was in high school it was done in health class by the coach.