I'm fairly sure all the "male" versions are unofficial and fan made. I myself experimented with it. It's basically an edited version of the original song.
If you use the audio editing program, like "Audacity," you can easily change the pitch of the song. Also note that not only are the vocals lower in pitch, but the rest of the music is as well.
Example: Bouken Desho Desho (TV SIZE) that I edited to sound like male vocals (I think I took the song down 5 half steps)
http://media.putfile.com/Bouken-Desho-Desho-Male