hi i am 27 years old n unmarried but having a physical relation with other women whoz 3 years elder than me.from past two years .weekly twice or thrice.now my problem is i m having alot of sexual feelings n thoughts n wants to have more n more times.but i cudnt make much time.wen we starting having sex it vl bcome hard in the middle very sometime it vl b down.but in my mind felling vl b wants to do some moretime. actually i donot have habit of masturbiting also.plz suggest me what was the problem.and how to avoid.