Bunk for tool

1 am 38 year old guy married with 3 children. My question is about sex life.? - prono start

I'm so busy at work and when I go home I'm usually tired, but I can always interested in having sex with my wife.
My wife is at home with the children busy and gives us just enough time alone for sex. She gave evidence that they are tired or not in the mood, or something. Today we have sex once or twice a month. Because of this practice began long masturbate once or twice a weak. I do not know if this is correct for a man. I even began to watch prono pictures and everything. But tell me what I should do, I should quit or continue. I know I'm in no hurry.