They're going to hear about orgasms but won't have any idea that when they're mature enough to handle the responsibilities, an orgasm is a magical feeling you can share with someone you love on a Hawaiian shore just as the sun sets. Or even in the bathroom with someone you just met at Starbucks.
When Dutch teens think they're ready to have sex with a boyfriend or girlfriend, their parents, some of them reluctantly, encourage the couple to do so at home. These situations, while novel to me, were treated with indifference by Western Europeans.
Our inability as a society to be clear about morality and sex these days, with adults increasingly seemingly incapable of holding the line about what is right and wrong in an age dominated by relativism means that often kids do not get clear enough boundaries.