Wetin concern us ...

In my opinion.... (am not married though)

Before a solution to a problem can be found one must first ascertain what the cause of the problem really is.
Your seeking help is understandable but u've really got to work more on identifing why there is a reduction in the urge to perform; some major causes have been highlighted here by some people but those are some of the general causes.
When finding the cause on your own becomes difficult i strongly suggest therapy