Before my mom passed, she was in a rest home with dementia and it was both sad and frustrating when she didn't know who I was. The only 'up' side to it (no pun intended) was my penis was hard in my pants when I got back to the car (parked some distance away) standing up as I was pulling down my pants and underwear to fully jerk off. I made sure I had paper towels so there was no mess from the loads I shot out, and wipe my dick right afterwards.