Should parents react to this? ⇐ General

[Anonymous]

If a boy and a girl of 15-16 years old have sex, and their parents find out about it, should they react to this somehow if they are normal parents?
It is clear that at this age many are already having sex, and on the one hand this is normal, but on the other hand they are not yet 18. Should parents react to this despite the fact that the age of consent is 16?
And how should they react?