I would be encouraging safe sex and supplying him.
I would be also stressing how seriously unimpressed his father and I would be at him getting a girl pregnant.
If he feels he is old enough to have sex, he is old enough to have his mother and father spell out the truth about teenage pregnancy and the consequences.
About having to pay for a child for the next 18 years and exactly what his responsibilities would be.
No point in pussy footing about the place with this.
Is he emotionally mature?
Because OP, I wouldn't hesitate to really take huge time to discuss his choices with him.
Should he get a young girl pregnant, you and your husband will be hugely affected by this, not to mind the girl and her family.
The consequences are huge and long.
I do not believe teen pregnancies are a good thing.
Teens are big children and they need every one of their years of childhood to be children before carrying the huge responsibility of parenthood.
Best of luck.