Nicely, sure. They could not have lied intentionally, but it only takes a single initial lie or scientific misunderstanding for a comprehensive myth to occur. In our initially pretty religious society, a great deal of myths around sex toys and masturbation have developed. Nowadays we verify out 10 you can securely dismiss.
If you grew up in small older Ireland like I did, you are almost certainly acquainted with the phrases "masturbation is a sin" or "masturbation will make you go blind".
The initially time you heard this was in all probability in college by the college nun or from the guys in your class who had obtained the same lesson from the school priest. Feel it or not, the Catholic Church very long considered that masturbation was a sin (they in all probability even now do!).