Masterbation... Be honest

Only when the queen comes on the telly.

The bible does not mention it, fornication is sexoutside of marriage with someone else, another sex act not allowed was denying your seed to your wife, to deny her a child. Lots of advice, dont have sex with a mother and daughter.
Etc.
Masturbation is hinted at... A man should marry ? If he cannot control his desires? But thats vague.
In todsys culture kids are bombarded by porn, i cannot see it being a source of condemnation.  God gave us a sex organ with vast amount of nerves.
We could have been like flowers if he wanted us to be paragons of virtue.  Some pastors say many people exclude themselves from christianity. Because they see this as animal behaviour?  We are flesh. Now. That changes later. While here we are corrupt.
If it was important jesus would have addressed it.
If you need to watch sex with kangaroos, you may have a problem.