(a) you are alone?
(b) you are with someone?
When I'm alone, I'll cum wherever it flies, which is usually onto my tummy or pubes (it rarely reaches my chest). If I'm feeling more tidy, I'll wank in the shower or bathtub so that I can wash off the 'mess' straight afterward. Sadly, I've never met anyone to wank with, but if I do, I think I would love to cum in his mouth or on his face.