hi, i have understood your problem,,, first of all, u must not attribute all your problems to masturbation..masturbation is not a habit, everyone practices it and it does not cause any sexual and physical exhaustion.. the semen is continuously produced in your body but the process is slow..think of a bucket full of water, u can remove water slowly until it is empty, now think that u are removing at the high speed and its refilling was very slow, at one point of time, it does not have enough water to remove u have ti wait for sometime for refilling it.. similar happens in case of your sexual glands which produces the semen, when u remove repeatedly then glands are exhausted, they need a break to produce semen enough for proper healthy ejaculation..on repeated masturbation with a frequency of twice daily or once daily the glands are exhausted, u shud reduce the frequency of your masturbation to twice weekly, and after u can see that your semen quality and quantity will be back.. once u have started thinking that u might have some sexual problems, u start repeated worries regarding your sexual performance in the future with your wife and this causes your erectile dysfunction and premature ejaculation.. repeated and harsh masturbation practice also predisposes to premature ejaculation, so decrease the frequency of masturbation and stop worrying that u have any sexual problems,, u are not exhausted and remember a man can not be exhausted even with aging,... erection with provocative material is normal, that indicates that u are not exhausted, u just need to control your sexual excitement and engage yourself in exercises, reading , hobbies, outings with friends.. u ll be alright, u need not leave masturbation otherwise u ll develop problem of night fall, the semen is produced to be removed by sexual act or masturbation but at a lower frequency.. i hope u ll find this advice helpful..best luck