I went to the bathroom sitting down my whole life (even when I was a child!!) and I always hit the water without sitting back, it hung straight down, maybe that was a sign :-) strange... :-).
I myself don't really think about it unless the bathroom is very very quiet. Often there's music, toilets going off, shoes clicking, people talking to others or on their cells. That's a funny thing, woman talk on their cells like crazy (or even start making calls) in bathrooms while men seem to close their phones before they go in.
For men. its in and out as quickly as possible, no loitering. I don't know what happens if you loiter... Do you wind up turning gay or something ;-).