The concern about safe sex has resulted in a revival of monogamy. But there is no turning back the clock.
Sex is out of the closet since the free love days of the sixties.
The problem with monogamy has always been boredom. The initial passion drops off pretty rapidly in a typical relationship, but not the lust of sexual desire. It s not that people are bad, they are just human. To be human is to be in a body. To be in a body is to be sexual.