Um... For anyone who doesn't know,

1 milliliter (ml) = 1 cubic centimeter (cc) [http://www.calculateme.com/Volume/index.htm]

They're the SAME measurement.

The average load is about 9cc, hence the name of the rock band "10cc", which was meant to imply some extraordinary virility on the part of the band leader - see here:

http://www.snopes.com/music/artists/10cc.asp

Assuming that many of the mopes at an American Bukkake shoot probably are more in the neighborhood of 6cc (and I'm probably being generous here, since historically these Bukkake boys truly are The Gang That Couldn't Shoot Straight, and often miss the girl, the bowl, eveything, etc. LMAO)

81 loads x 6cc/load = 486cc (i.e. 486ml), which is nearly 1/2 of a litre, or about 16 oz (1 pint)