Tsubomi sure doesn't mind the odd shot of jizz to the face, does she now?!
I think some of the old movies made by Shuttle (http://www.shuttle-japan.com) featured very high numbers of men dumping their loads. I myself think 25 or so cumshots is enough. Gets a bit boring after that; plus, the whore's face tends to become too slippery to effectively 'hold' any more jizz, so it just falls off....bit of a waste.