Well, virtually all religions preach some form of self control and delayed gratification. To the degree religions long endure they had to accept some 'dogmas' about human behavior such as not sleeping around. Most cultures have coming of age rites for boys and girls and lots of rules governing courtship, engagement, marriage, and what's expected of married couples.
So to the degree people obey the rules and delay gratification, they will avoid a lot of this sort of grief. But to the degree luxury, plenty, and peace militate towards instant gratification the rules and dogmas will seem ridiculous if not like strait jackets and will be junked in favor of "freedom" (which results in the slavery to vice).
Thus we get kids engaging in all manner of casual hookups and oral/anal behavior as though it "doesn't count" and then we're shocked, shocked, to find out they're becoming infected with STDs at alarming rates?
There's a fine reason why, despite 50 years of official government support Blacks remain just 12% of the population: abortion, sterilization, the breakdown of the family, etc. many remain nominally Christian but it has less and less impact on their culture which is more and more about instant gratification.
Now many this is a K/R sort of debate. But it seems to me, the problem is not racial as much as cultural and insofar as culture is created by religion - by worshiping something as the maximum good, (an idol suffices btw, so Marxists can be religious), sexual morality is always influenced by religion.
So what do these people worship? Instant gratification. The god of eros. They'll swear up and down that they're not religious but they are. They believe with a zealotry that's quite impressive that physical pleasure, self-centered, or at most "consensual" is the maximum value, the point, purpose and highest meaning of life without which one cannot be free and cannot be called "winning".
Thus the country's laws and social rules are increasingly made to facilitate the worship of eros and making delaying one's gratification hard if not uncool or even illegal.