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I can't remember where I heard it, but the explanation I read goes along the lines that during sex, *ALL* of your membranes swell and engorge with blood, including the ones in your nasal passages along with the usual erectile tissues. It's actually caused by serotonin being released moreso than the sex itself. Serotonin, while a part of your various pleasure and reward systems is also a key component of your autoimmune system which is what makes you sneeze.
I have this same "problem" too, but I just don't consider it a problem. A seriously good hard cum will have me sneezing for a solid ten minutes. Taking pseudoephedrine beforehand will help, I haven't tried other anti-allergy drugs in this context though.
There's also a chance that what dancingdoc said is true instead, but in my case I have indeed figured out that that is not my problem. Try doing it somewhere else a bunch of times to see if he sneezes to rule this out.
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