And a hundred years ago, so did a lot of doctors who were convinced that it make you go blind or insane. Let's face it, all masturbation does is make you postpone the need to get a spouse, to start having kids with. That's why religion was against it, or anything that did not help increase the flock.
You wrote:
"Let's face it, all masturbation does is make you postpone the need to get a spouse, to start having kids with. That's why religion was against it, or anything that did not help increase the flock."
No. Religion opposed masturbation because it was sinful. Also, you seem to think that the sin of masturbation is limited to only those who are unmarried. I guess you've never read anything at all in a newspaper or magazine or book about the rise of sexual addiction, internet porn, etc.? If Christians were only interested in increasing the flock then traditionally minded Christians would see no problem with artificial insemination!
Wrong. That isn't all it does.
It teaches you that your sexuality exists simply to serve your need for selfish pleasure, apart from being any sort of gift to anyone else, most particularly to God or to your (future) spouse.
It's a wretched preparation for marriage, because it teaches "lessons" that simply need to be unlearned to be happy in marriage, and to make your spouse happy in marriage.
Masturbation also trains you in self-gratification rather than self-donation. It makes real, responsive, spouse-centered sexual love difficult. It builds up habits and attitudes which sabotage intimacy in marriage.