interesting ,i made a post. same problem. 1-2tbs is a lot, i doubt you are measuring right, if you get a shot glass and fill that, thats 2tbs, i doubt you can do that, or you would be in porn, but i don't hold it against you, unless you are jizzing into one of these:
measuring shot glass | Flickr - Photo Sharing! you are not getting an accurate measurement...
I do roughly 8ml everytime, and i can do that about 4-6 times.. i was telling her, i wish it all came out at once it would be amazing, she just always says how amazed she is how i can go right after the next, with little to no rest, oh to be young!! we are talking 10 seconds to 1 minute and im ready, and one time she gave me head and i busted huge load, and i said go back again right after i busted, i was not sensitive at all, and busted another huge load, so i am frustrated myself on this topic ... i wish there was a way to get it all out, but then again, i don't mind being able to go numerous times with a decent amount everytime. who knows... i guess i want the best of both worlds!