Jeez, I'm such a bold parent I told my son, and a handful of his friends, who were all standing around the counter after school one day, all about 12 yo,...
"Y'know boys, when you're masterbating, (yes, they all turned bright red, but they knew me and I speak strange uncomfortable reality that does a person good, so they didn't run), you should practice different rhythms. Y'see sometimes fast and efficient is perfect, it's called a quickie. However, if you want to keep your gals happy when you get attached, you'll need to be able to last a long time, like up to half an hour. You can do most of that by changing the rhythm. So sometimes, y'know, do it and get off, but other times, challenge yourself to last as long as you can."
I guess my atheism runs deep. Oh, and all the neighbors were either Catholic or .... Mormon. So these kids thought I was bizarro, but I think I truly appreciated that I was honest and open.
Oh, well this thread isn't really about sinning and religion re: masterbating, I'll hush now.