This was already accomplished in 1973. Please wait until the 1 minute mark and you'll see what I mean....

http://www.youtube.com/watch?v=bpV5InLw52U
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"I'll never forget the moment during the lovely Alyssa Allure's scene in 'American Bukkake' where the fellow got out of his wheel chair to ejaculate on her face. It was grotesque but had a certain frisson." -Sock