I like the missionary facial and actually don't aim anywhere in particular. I just let it fly. I have no regard for where it ends up because I think that is the best way to do it.
I will always say close your eyes when getting close though...I am a gentleman after allThe only time I aim is when she has her mouth open and tongue out, for me that is an invitation and it would be rude to decline it. In those cases I will make sure that some goes where the lady wants it.