Ha interesting subject!
As a girl i just crouch over the loo wihtout actually sitting - it is unbelievable what mess you find on some loo seats - argh. but is is hard work and i hate it in small loos cause of hte smell - even with a spray etc.
my nurse told me when i first got my bag that if i stood up to empty, i should throw a lot of paper down the loo first - so you could always do that. what fun we have