HAAA! This is great. Years ago a friend and I were walking down the street, looked at each other, and both went "Do you... do you smell semen??" Eventually, we figured out it was the trees with the white blossoms (figures). We had always called them semen trees (but a less formal word than semen that I'm not sure I should be using in this forum).
And the best part is, when you're walking with someone who then says "These trees smell so amazing!"
Bradford Pear. One of the worst choice of trees in any landscape.