text: is it normal for a man's libido to decrease? i'm 40, and have noticed that sex holds much less importance for me than it used to. to the point that once or twice a month is enough for me. any other men out there experience this? yes i have from time to time. the first thing i would do is get a complete physical including a testosterone level. many things can cause a decrease in libido such as over work, financial problems, court appearances,  and a partner who is super critical of everything such as my ex wife. all of us men go through periods such as you describe but eventually the interest returns.  if it doesn't, i would not worry if i was you because the more you think your not interested the more you won't be.  also, libido varies a great deal from person to person so enjoy the lack of stress that a low one gives you.  if you're single, think of all the money you'll save.  good luck!