Hey! It was an accident! And I'm going with yes, since it makes more sense than "we forgot", although it's amazing Evil Willow didn't rip off her eyebrows for that.

That would've been so cool.

No. Since apparently they only get the cool bodily functions -- come, blood, and tears, but no peeing.

Because ew? They'd piss blood. But sweat can be cool. In a hot kinda way.

Not applicable, Angel makes my inner Spike squee but leaves me pretty lukewarm.

Hey, no big--as long as he keeps your inner Spike satisfied...