Ok I don't know if all people can do these, I'm cut so I don't know if it makes a difference. Ok all of these require your wang hard except for the last one
1. Ok while your jacking off take your balls and try and push them into these little pockets that makes them out of the scrotum and into two wierd pocket try and keep them in there and keep jacking off
2. When your jacking off feel around under your scrotum for a hard 'tunnel like thing under the skin' then take an object and press it up to it and keep jacking off
3. If your a humper try this when your wang is soft grab a pillow and strip point your soft wang down then as fast as you can put your pillow on it so it can't go up proceed to hump.