OT: I don't know, but "horny Goat weed" sounds a lot less exciting than something like "horny babe weed" or "horny stud weed". In general, mamajuana sounds like something you'd find at a CA cannabis club. With that stuff, everybody's beautiful.
Of course, Joe Jackson probably summed it up just about right with the following (from Pretty Girls, on Look Sharp)
"God, if you're up there, listen to my prayer
In future man should have a different design
Give him a switch so he can turn off his libido now
Give him a tranquilizer built into his mind"