i would have said no on safety grounds.
i don't imagine this is something that tesco condone.
however, if sons or dh home, i may have said yes. depending on my mood, what i was doing and if the house/bathroom was clean.
and it wouldn't occur to me to say no on the grounds that he might wipe his knob on the toothbrush - i mean who thinks like that? with a thought process like that one could presume this
you say no
he remembers
pisses on your fresh produce, shakes it dry - next time time.
you go to a restaurant, you automatically assume they are going to wank in your curry/ soup
you never go to a public toilet becuase of the amount of things ones imagination can assume.
its ridiculous. you would wear gloves all the time and never turn a handle in case the man in front didn't wash his hands after holding his dick for a piss ( which dh says is disgustingly frequent)