Lycurgus (15.5-15.6)

And this they did not for a short time only, but long enough for some of them to become fathers before they had looked upon their own wives by daylight. Such interviews not only brought into exercise self-restraint and moderation, but united husbands and wives when their bodies were full of creative energy and their affections new and fresh, not when they were sated and dulled by unrestricted intercourse; and there was always left behind in their hearts some residual spark of mutual longing and delight.

After giving marriage such traits of reserve and decorum, he none the less freed men from the empty and womanish passion of jealous possession, by making it honourable for them, while keeping the marriage relation free from all wanton irregularities, to share with other worthy men in the begetting of children, laughing to scorn those who regard such common privileges as intolerable, and resort to murder and war rather than grant them.