staying wet

Paige
My bf and I have had sex a few time and normally I'm fine and stay wet but the last few times I can't stay wet and he does not finish. I drink a lot of water, between a half a gallon to a gallon a day. 
Could it be the condom. I'm not used to them. But I love when he finishes in me so I like condoms. I just don't understand why this is happening. 
Is it possible he over eats me out? 
Has this ever happened to anyone? 

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