A guy at work told me cucumbers help, So I started to try and eat one a day.... and to tell you the truth I think it has been working.
Other than that just give it a rest for a week or two. I once went 2 weeks and when the time came that nut must have shot 10 feet...the down side is that holding off that long gave me a little bit of stomach pain kinda like when you get kick in the balls but it wasn't that bad and didn't last long.