Via Sullivan, a collection of data and infographics about "the battlefield of love:"
There are many opportunities for failure with 3 million first dates every day worldwide.
It turns out that sex is pretty important as 56% of adults claim to be unhappy with their sex life and 22% of married people worldwide have had an extramarital affair. Turkey has the highest rate of affairs with 58% of married people, and Israel the lowest with 7%. Cheating is one of the most popular reasons for breaking up with 25% of women and 18% of men reporting it as the reason for their last relationship's end.
Many find success as 2.5 million per year vow "Till death do we part," albeit nearly half will break that vow. 5.4% of adults, for better or worse die having never married.