Consenting ADULTS should be able to sleep with whoever they want and be in a relationship with other consenting adults. I don't have a real issue with that.
Morally, the world is more progressive today than ever.
People always clamour for the past, but really ... that was a time when women were burned at the stake for witchcraft (which basically meant anything some random guy wanted to pin on them), a good family Saturday out was watching someone get hung to death or have their intestines ripped out in the town square, and where if you were born in the wrong skin color you were subject to inhumane slavery and life long suffering.
Yeah, 21st century isn't all that bad by comparison.