Naked selfies from people I don't know

[Android Central Question]

I have found nude pics of several women and more of my exhusband on my Samsung tablet in the "photogragh" icon, NOT my "gallery". I have been divorced for 10 years and my ex husband and I have NEVER been friends on Facebook and he has certainly "NOT" HAD ANY ACCESS TO MY SAMSUNG TABLET. I called him PISSED OFF and he does not know how this happened. Some pics were taken at his home, he has NEVER had my tablet, I NEVER saw these pics in my messenger box either. We haver NEVER BEEN friends on Facebook, I have meesngered maybe twice about our son. This is VERY UNNERVING to me to see this. How could this possibly of happened ?