Rob Gronkowski -- Erotica Novel Hits Amazon ... 'A Gronk to Remember'

Gronk scores touchdown. Gronk spikes football. Gronk makes married woman wanna cheat on her husband.

That's basically the plot for a brand new erotica novel called "A Gronking to Remember" ... an X-rated book (available on Amazon) penned by a woman with a serious obsession with the Patriots tight end.

The book is a 38-page fantasy by Lacey Noonan -- who drones on and on about how watching Rob Gronkowski play football sends "jiggling ribbons of electric jelly" through her body.

To complicate things, the main character says her husband isn't getting the job done in the bedroom -- leaving her "aching for a love pummeling" from #87.