Dude, sex/masturbation and PE do not mix, so keep them seperate. having both on the same day is fine, but keep them at least a couple of hours apart, also, try not to masturbate during the PE session.
I don’t personally have any exercise routines handy, but any kind of physical exercise is good for your PE efforts, as well as overall general health, because it raises hormone levels such as testosterone and growth hormone. You should probably try not to overtrain though as this will not only cut back your gains in muscle but your dick will suffer as well. if you overtrain then no part of your body can grow, including that one part we’re all trying to make grow ;)
Also I do not personally recommend kickboxing as a choice of martial art, especially if it is your first…. It is helluva brutal and not very complicated or graceful. I wont go into the history or anything, but this is basically because it is designed with the sole purpose of inflicting as much fatal force as possible. Eg shatter the ribs, smash in the face, and crush vital organs. It is not a pleasant sport, especially if you go to competition level. I would much rather promote something more skillful, kung fu is brilliant in it’s grace and style, and it will give you just as good a workout as kickboxing could ever.
Hope that helped. :D