The entire idea that that age is one needing anything like the kind of parental oversight we indulge in in the U.S. is very, very new.
Hardly. Until the last century or so, couples were never allowed to be alone until after they were married. Look up "bundling," which was a kind of courtship "cuddling" allowed in cold weather. They'd literally put the guy and girl into bed, cover them in a quilt, then SEW IT SHUT, WITH A LINE STITCHED BETWEEN THEM. Or, if they were progressive, they could make do with a board or sack of grain between them. There's also the idea of "keep one foot on the floor" while making out.