There was a variant version as well:

A popular motivational speaker said :

The best years of my life were spent in the arms of a woman who was not my wife..!!
The Audience was in silence and shocked..

The speaker added : And that woman was my mother..
The Audience Applaused...

A top Manager trained by him tried to copy this at home after a drink.

He said loudly to his wife who was preparing dinner :

The greatest years of my life were spent in the arms of a woman who was not my wife..

Standing there for 20 seconds , trying to recall the second half of the joke , he finally blurted out :

I Cant F###ing Remember who that b###h was ...!!