Right idea, not a great example. People used to have lots more kids then now, most dying in childhood. Majority of women of childbearing age (gay or straight) were married and having children as often as their body allowed, so promiscuity would not have changed much. Maybe a minor correction for male infertility and sexual boredom in a standard marriage.
You seem to have rather a different idea of what I meant by "2012 standards". Even now we do not really approve of married people sleeping around. We do, however, approve of people not getting married until age 25 or 30 or so, but sleeping with whoever they like before that. Try that pattern without contraception.
Here's the new thread for posting quotes, with the usual rules: