First of all, I have to say I really like the site you posted, redrose. I can't wait to try it either.
It would be really funny to pee standing up in front of my bf. lol.
On to topic...I usually flush at home even if it's a family memeber, friend or bf. There are those times, however, like early in the morning or really late at night that I just don't bother.
In a public bathroom, I ALWAYS flush if there's something there. YUCK!!!! (I "hover" also)