hi...thanks for writing..i have understood your concerns.. first of all, why the frequency of sex is once in fortnight? it shud be high..whether there is any marital disharmony between you two? you are married person why are you masturbating? you shud have sex whenever u want.. premature ejaculation may result from the conditioning developed due to repeated masturbation in which you are stroking fast and ejaculate early... so, first of all, in my opinion you shud reduce the frequency of masturbation and go for sexual intercourse more frequently.. you shud not worry about the sexual performance repeatedly, otherwise the anxiety will cause problems with ejaculation as well as erection.. even after following the above advice, the ejaculatory problems wont resolve then u shud consult a psychiatrist and ask for help..tell your doctor about your problems in details..there are behavioral methods and drugs available to treat premature ejaculation..there is nothing like shame in seeking professional advice.. i hope u will find this advice helpful..best luck..