Uh oh, found a real one, well I think. I found out about the 33hz thing. Straight to the point , there are many discussions and claims that 33hz causes erotic stimulation in women. Maybe a harmonic of the characteristic hum in a male voice, like a Harley or some big airplane motor. But according to the articles I read, 33hz is the peak of effect frequency. Here, sit on the subwoofer baby. Fasten a chair on , what ever get her going LOL. Now what happens if a listener doesn't know about that ? Is it unfair or intrusive ? We could eventually be challenged on that issue due to the large number of news and discussion articles. What happens if a root has 33hz in it unintentionally because it has the sound effect the artist wants ? Well I thought over and decided most everyone knows music changes and even makes moods. When people want to be stimulated for one thing or another, they listen to a song they think suits their mood. So just don't listen to it if you don't like 33hz.