I know it seems like a shameless plug, but if you dont mind supplements, we use this stuff.
The girl will be gagging...You will be a one man bukkake show.
I've been using for awhile, just for shoots. Drink plenty of water before shoot. 2-3 liters in the hours before...
http://www.1automationwiz.com/app/?af=864155
Typical comments from the ladies: "Is that normal for you?" "When will it stop?" Damn, boy, how long you been saving it?"
All natural, known the product and the producer for some time.