Telling daughters to save virginity for a special *man* (gender neutral language when writing about mating is absurd) is the opposite of waiting. That's cultural acknowledgement of women being prone to sexual impulsiveness. The older culture at least pressured her to marry.
In a rapidly expanding population skimming off those men to leave no surviving descendants is huge - had a huge effect on the amount of crime That bit was only a window where we have data; the pressure to weed out certain "impulsive" male mating strategies was present for longer