I'm only posting this because of what my initial thought was when I was trying to explain what I smelled to my friend. Anyway, I was driving down a small road that only has one lane in each direction. There is a concrete bridge somewhere in the middle of its couple mile stretch. It was in the evening and it was a bit humid outside. As I got close to the bridge I smelled something odd. I couldn't figure it out, but I didn't like it. Then I got to the bridge and the smell was overwhelming.......it smelled like semen! I swear it smelled like King Kong came by and blew his load in the creek under the bridge! LOL It was horrible. It took another mile for the smell to fade away. I have no idea what it could have been.