That was what I thought as well but I am beginning to have doubts. The vapors are lighter than air so they should be able to rise up through water also they may be able to pass by a worn out seal that the water cannot. That is my thought but it is unfounded. I guess the best way to check this would be to yank the toilet off and plug up the opening with one of those rubber expansion caps and then see how it does.
If I drive around with the windows open and bathroom door open the smell will clear up but then after the door is closed for a few hours it comes back. Should be able to test it then I guess.
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