Yes they do go to Hell for Masturbating, even for lying. It is a commandment you know.
The difference is that we all lie, not all of us truly seek God and repent. The difference is obstinant rejection of Gods mercy and repentance and continuing in sin without caring about offending God.
If we did care we would repent and strive to do better, by the Grace of God we are able to not sin.
Even going to Calvary Chapel I knew something was wrong with artificial birth control, it is with a total rejection of concience that we start to think that sin doesn’t matter. Eventually we don’t notice when we curse, when we sin, etc as it becomes what is comfortable to us.
We start to wallow in sin and what is good seems foreign to us. This is why some react so strongly against celibacy even as it is a more faithful imitation of Jesus.
Sin changes you like a diseased eye, what is good and normal becomes painful and difficult to even want to see.