

No, I would simply give them a box of condoms or whatever.
If they’re gonna do it, they’re gonna do it, and as a parent, you’re way better off with your kids comfortable not hiding it because if there’s complications you can intervene quickly. If the condom broke, you want the kid to come to you so you can get plan B and not have to deal with an abortion a couple weeks or even months later. It’s also way better they get caught doing it at home vs in a car and now be on the sex offender registry.
What you’re describing is abstinance and is common in religious families, and well know for being ineffective. Plus as you’ve described, it completely falls apart when bisexuality is involved, and it makes even less sense if it’s physically impossible to even get pregnant.
The same extends to alcohol, drugs, porn, whatever evil vice people are worried. If your kid’s gonna do drugs, you want them to feel comfortable calling you if they have a bad trip, and also feel comfortable giving you the drugs so you can get them to the hospital and they can quickly identify what you’re on and give the necessary medications.
They’re gonna learn about all that eventually, better they learn it from you. Punishment and “you’ll understand when you’re grown up” doesn’t work. If they’re old enough to ask, they’re old enough for the answers too.
You can mostly backup everything but it’s impossible to make a perfect backup like the old days anymore because of the TEE. Flashing a new ROM will change the keys and permanently make the old data worthless. Stuff like Google Authenticator for example simply won’t backup even with a perfect bit copy.
Apps will restore okay but many will be logged out and have lost their permissions and push notification registration with Google.