How incredibly naive.
It wasn't that long ago the AIDS activists had a slogan:
Sex=Death
You might be correct if you speceified monogamous sex but you are certainly incorrect if you think that of pagan orgies.
you're projecting your own naievete. The products of sex surround you and you would believe that sex = death. That problems of the world are to be blamed on sex outside of marriage is laughable.
Crime and sin are similar but not equal. IOW sex outside of marriage is sin, but not on the level of murder, thievery, or coveteousness.