Urine is sterile. Toilets are not. I'd say it's much more hygienic to urinate standing. We don't sit down because we don't have to. It's really as simple as that.
Urine isn't sterile, though[1], and there's good reason to believe that the toilet seat is one of the least concerns when it comes to sources for bacteria[2].
I can buy the argument for "I prefer not to sit", but I'm not convinced about the hygienic aspects.
On the eighth day, God came down with his bag of tricks and offered to both Adam and Eve some goodies.
Heard from the heavens: First In The Bag, Pee Standing Up
Adam immediately gets excited. "Oh, that would be so useful as I'm in the fields toiling all day. I wish for that ability to be bestowed upon myself". And so it was, that Adam could now pee standing up.
Heard from the heavens: Second In The Bag, Multiple Orgams
Life would be hell for a man with multiple orgasms. Imagine an itch that won't go away no matter how much you scratch it. The male urge to mate is very strong, but goes away the instant the act is completed. Sex does indeed mean everything to men some of the time, but it means very little most of the time. Without that relief and absolute end to the act it would be more like a never ending drug addiction than something worthwhile pursuing.
