As someone with actual teenagers in actual school (in a state where the health curriculum, including sex ed, is pretty comprehensive) I have some thoughts about this.
My observation is that teenagers seem to fall (at least in this matter) into two buckets: the "not going to have sex in high school" bucket, and the "hell yeah!" bucket. I was in bucket 1. MrInCO was in bucket 2. We have one teenage son in each bucket. This is not because our values changed mid-child-rearing, it's because they're different people. I've also noticed that adults who themselves were in bucket 1 have a hard time imagining that some kids would legitimately be in bucket 2, and can be pretty judgy about it.
After quite a bit of thought about this, and nonjudgmental discussion with a surprising number of people in real life, who grew up all over the US and various other parts of the world, I've about decided that "know your own kid" should be a guiding principle.
But also that ALL kids should be educated about the basics of how sex works, what the more common variations are (i.e. gay/straight/??), why what they see online is unreal, and, yes, how to apply a condom. With practice (on a broomstick, duh): no condom is going to apply itself, and it's fairly important that it be used correctly, whenever it is that you use it. Also discussion about respecting other people's desires, being able to communicate clearly, and the advantages of various types of birth control, including abstinence.
Because even if you're in bucket 1, your kid may not be -- and even if s/he is now, at some point sex and desire are likely to happen, and having some basic knowledge is never a bad thing.
And FYI, condoms in person at drugstores cost about an hour's work (or more) at tipped minimum wage per package of 3 - 6. If you're a high school student, that's a meaningful amount, and you still have to walk in , take it off the shelf, (or ask for it, if it's behind the counter), pay the cashier... if you're living in a place where that's going to get back to your disapproving parents, that's a big deal for a teenager. (I happen to think that if you can't go to the store and buy your own you shouldn't be having sex, but I don't deeply disapprove, so my kids don't have that fear.)
If the overarching concern is to prevent unwanted and teen pregnancies and STDs, condoms should be readily available, and everyone should know how to use them. It's another kind of harm reduction: you can continue the conversation about values, but meanwhile STDs aren't being spread, and pregnancies aren't occurring. And, seriously, preventing people who are not you from accessing reliable birth control is just another way of controlling young people, and female people.