[AppyPappy]

said Mom/Dad i'm going to have sex and I can either use a condom or not use a condom.

The same thing I would tell them if they told me they were going to jump off the garage with or without an umbrella; Don't Do It.

[HELLRAISER II]

Your answer is the responsible parental answer, I agree 100%. But read my post completely, what if they're going to do it regardless of what you say. I think the Condom is the right choice if they decide to have sex, even if it's against your wishes.