This is called small penis overcompensation. It happens when those dudes with 3.5 inchers become frustrated by their partners lack of enthusiasm. So they pump harder, faster and deeper but often to no avail. Eventually the chump reaches a breaking point. Somewhere in between the 4th and 7th yawn. Funny shit.
Vigorous mental disabilities turn an unforeseen leprechaun into the alpha male you never know you wanted... as he maneuvers his way through a sea of chromosomes. She ends up totally mortified. You end up totally erect.
Downside to MILFS having a mid-life crisis? Every time you try reliving her youth, the menopausal bitch fest comes roaring through. Then there's the other end of the spectrum: Mom's with foot-longs, but no time to use 'em.