The 47-year-old doctor and his radiologist female partner, 40, were put under investigation after the USB stick was found in a jacket at the local laundrette.
It contained images of the couple using medical equipment while having sex and other photos of female genitalia, Corriere della Sera reported.
The USB was passed to police in Ponsacco, in the province of Pisa, who went through the couple’s laptops, USB sticks, photos and objects to practice sadomasochism.
The investigation hinges on whether the surgical equipment used belongs to the hospital where the couple works or whether the items were bought by the medics.
The pair, however, argue that the images are private and should not concern authorities.