Hate to follow richard's story (ugh), but here goes.
I don't hobby unless I'm horney. And when I'm horney, there's usually a buildup. Facials are usually discussed beforehand, but on several occasions, the drenching was unexpected and surprised her. A couple of times, I was pleasantly surprised by her running to the mirror to see her pornstar face, and on one occasion, I was asked to photograph her.
Another issue is the angle....if she's lying down, there's a good chance you'll miss and splat all over the headboard, which is not good. I've learned to have her on her knees in front of me so she'll catch every spurt. Works best.