Lately my boyfriend has been saying he can smell things that I don't smell at all. At first, I thought maybe his nose was just more sensitive than mine, but I have always had a very sensitive nose. In addition, a few people have been over the house and when we ask them, they can't smell anything either. Is there anything that can cause a heightened sense of smell in a male? Do you have any suggestions or answers for this occurance? Thanks alot!