I think the following could go a long ways in helping... but you have to be disciplined to the exercise. Learn how to do Kegel exercises that work your control muscle that is used for both controlling the stop/start flow of your urine and it's also involved in orgasm. Start by doing a set of 10 where you hold that muscle for 1 second. Do 3 sets each day (a total of 30 in one day, spread out during the day). After a week, extend the muscle holding to 3 seconds each but still in sets of 10, and 3 sets a day. Continue to build up the hold time... e.g., to 5 seconds for each hold, then 7 seconds. In 30 days, it's very likely that your problem will be resolved.
Stick it in her ass, you will cum in less than one minute.