my wife has very low sex desire her age is 30 but still we are having sex approx once a week, which is leading me to mental agony.i feel some time making extra marital affair to satisfy my desire,but think it would ruin our life completely,i had talked to her many time regarding my sexual desire ,but sex is her last priority,also whenever we had sex she was satisfied completely and enjoys,but still to arose her for sex is very difficult