At around age 40, is it mostly wives or husbands complaining about a lack of sexual activity?

Men seem to reach their sexual peak in their early twenties; women in their late thirties.

But since the wife have been shutting him down for fifteen years, I can't see how she can be justified in beefing about it...

If you have a good relationship and you both keep the other's fulfillment as your foremost goal then there is no lack about which to complain. Don't worry about who is complaining. Worry about making sure the problem doesn't arise.

Men complain to me about their lack of sexual activity with their wifes and/or girlfreinds.

I think it's probably about even. My wife tried the "I want this and that or no sex" line several years ago. I never give in to blackmail. So I chose the no sex. Problem solved. Life is so much easier without the sex issue.

I have seen both. I don't think either sex has exclusivity on this. It sort of becomes a vicious cycle and usually leads to infidelity, bad feelings on both sides and divorce. Just keep having sex people; it's not rocket science (unless you want a divorce, of course).

It could be either. Depends on situation.

My libido is very strong and I am in my forties.

However, I have not begun the process of menopause yet.

When I do, there is a possibility that my sex drive will change.

Men also go through 'Male Menopause'. It is called 'Andropause'.

This could possibly lower their sex drive, as well.

I don't know, I'll have to wait to be that age to find out but very good question..if i was to guess i would say wives, most likely

it's the dudes complaining about never getting any from their wives, and their wives complaining about everything else on earth you can imagine.

not in our home... but I notice that a lot of women really let them selves go and then think that the man is going to stay interested.. the same thing that attracted him is going to keep him... men we usually take them as is

husbands sweet mildred is our leader..crawl into her playpen