Look at non-Muslim countries:
Pregnancy: Thousand of teens get pregnant each year. Their whole life gets ruined just because they were so tempted to have sex. Kids are not prepared to have kids.
Cheating: According to US NEWS, "15 to 18 percent of ever-married people have had a sexual partner other than their spouse while married. "
How Common Are Cheating Spouses? - US News and World Report
Divorce:50% percent of first marriages, 67% of second and 74% of third marriages end in divorce, according to Jennifer Baker of the Forest Institute of Professional Psychology in Springfield, Missouri.
Divorce Rate : Divorce Rate In America
STDs: (thousands of people in the US get infected with sexually transmitted diseases each year)
STD statistics for the USA
While in a Muslim country, it's VERY rare for any of those things to happen. Why? Women and men cover themselves. They're not tempted to have sex before marriage.