Flushing the toilet when there's nothing in it but differently coloured water is a waste, but I understand why you have to do it in a social context. I would prefer not to needlessly strain my shitty pipes, but I prioritise other people not needing to know that I piss just like they do.
Anyways, this is a very obtuse way of asking how many times does a person have to come to your apartment before you can shamelessly not flush the toilet after (visibly) peeing?
oh ive seen some toilet systems (maybe just a urinal?) that is positioned under the sink bowl so that when you wash your hands it rinses the piss down with that water
your synthesis but unironically. dialectics always wins