Unfortunately, that was made the case as people tried to distort the original meaning. Our Lord was a first century jew. He spoke almost exclusively to first century Jews. There is a certain shared cultural understanding that has been lost in our modern western world.
Masturbation was not much of an issue when people regularly married in their early or mid teens.** But now, when the average age of marriage is in the mid to late 20s, it is a HUGE issue.
** in first century Judea, marriages were arranged by the parents when the couple were age 7-9. At about age 12 or 13 the families would sit down and negotiate a contract of marriage called a Ketuba. It was a legal contract and the couple would be "betrothed." That was was more married than just engaged. After that was signed, the boy would start to build a house under his father's supervision, which would take about a year. After that the couple would move in and consummate the marriage, and then have a party for about a week. So they were married (having sex) at age 13 or 14.