We have our sex drive our entire life but like everything it ebbs and flows!  A man's interest at 20 is influenced by different variables than a man in his 40's!  Chances are that 40 year old has had his share of experiences and sowing his seed.  At 20 it's a new world to explore and fortunately there is plenty of 20 year-old testosterone to support the adventure.  The testosterone tank isn't always as full at 40 even if you are mentally rearing to go.

Despite this, you can't blame low sex drive on hormones no matter what age you are. You can always consult your physician or a sex therapist to make sure everything is in check physically and mentally.  Until then, here are some of the many factors that contribute to low sex drive in men: 

• Being overweight
• Eating an unhealthy diet
• Sedentary lifestyle
• Abusing alcohol, tobacco or drugs
• Medical or health conditions
• Not practicing stress management
• Being a workaholic
• An unhappy relationship
• Poor self-esteem

If the problems aren't physical then look at your relationship.  We usually think it's the woman who doens't want to have sex.  According to Psychology Today there is an increasing number of men who have lost interest in their partners.  In heterosexual relationships the men often feel detached from their partners and don't want to have sex.  Once this happens the intimacy everywhere in the relationship is effected.  I always say this is like a bridge that starts to lift and the gap gets wider and wider to the point of no return.  This is when infedility and divorce become a risk.

If you've ruled out health or medical problems and you're not unhappy in your relationship then just have more sex!  I can't tell you how many times I tell people to just DO IT even when they don't feel like doing it with their partner! 

Sex is healthy and sex is fun!  Not only does it burn calories, it also makes your skin look great!  Certain tantric moves are healing, it gives you energy, makes you feel more desirable and heightens your emotions all together.  So just DO IT whether you are 20, 40 or 60!

"While I can't say that you'll ever feel the ultimate heart-stopping passion you felt the first month you fell in love with your partner, I do know this: there are many of us who settle for predictability when we could have more excitement; friendship when we could have intimacy; medical problems that kill our sex life when we can correct them; and the status quo when we could have a relationship that is constantly evolving and renewing itself." ~Dr. Alan Altman

A co-author Making Love the Way We Used To...Or Better: Secrets to Satisfying Midlife Sexuality