The concern, apparently, is that pornography may be addictive and equates violence with sex which may "normalize a rape culture", encourage group sex, risky sexual behavior, increase infidelity and reduce the desire to marry.
There's also the issue of not being judged for having "interests" and needs that may not be consistent with a partner's.
Now, now, don't clutch your pearls, I'm not advocating teens watch porn, but don't you agree that this is their thought process? Plus, it's "titillating". Alright, I'll stop.
Do your best to maintain parental controls on their devices. Know that you can't micromanage every single thing in your kids' lives, but you can make sure you are "receptive, approachable and nonjudgmental" (RAN) so that when your kids have questions, they can come to you. You also can't control what other kids see and report back to your child.
The deal about sex is not the "parts", but the emotions...love and lust and all that stuff. If you begin by not being "nervous and jerky" about the parts, when it comes to love and lust, they'll also come to you for your wisdom.
The fathers also augmented by using sex education and visual material for those with disabilities. The "tutorial" proved successful. Both of these young men went on to enjoy long-term relationships which, I assume, including a sexual component.
Just do the best you can, Claudia