You are obviously scared of the pussy deep down
You associate nutting quick with fucking and that's why you do it. So its now a programed rule.
It's a mind thing and just like any thing else when people are consistently not confident in their
capabilities they fail at it over and over when ever they try it.
You can reverse this by working on your confidence in other areas of your life first and then
once your seeing some results else where you can attack this area with the critical amount
of confidence you need.
Start with smaller problems first to get some momentum going (consistant belief in yourself)
and then you'll be prepared to tackle the penis.
This will work with all sorts of problems from personal to financial.