Married, But Always Jerking Off

I've been married for 20 years and sex has always been good but I always maintained the masturbation habit which started when I was 14.
I masturbate regularly, almost every day and sometimes more than once a day!
I always look forward to being alone and as soon as I know that my wife will be going out, I start getting excited thinking of my freedom to jerk-off........
When she leaves, I switch on my PC, watch porn and masturbate............sometimes on cam showing others what a pig I am. Sometimes I look through the laundry and if I am lucky I find one of my wife's used panties, possibly stained, sticky and smelly and that will arouse me even more.....
After I cum, I keep masturbating until she returns.
I need it, love it and will never stop doing it.