The North hall of CES is like a different planet. Car culture dominates geek culture here, but you still find weird things like this mini wall of 7-inch Kicker solo-baric L7 subs. They were outputting a low roar that felt like a massage or subtle brush against my skin when I leaned in close. I wouldn't say it was erotic, but I wouldn't say that it wasn't erotic either.
solo-baric L7 are a joke. Kicker is a joke. Their whole gig is to get as loud as possible, sacrificing sound quality in exchange for sound volume.
I have studied acoustical engineering, and have been involved with car audio for over 8 years. I have NO clue what Johnnyabnormal is talking about. There are mythical brown noises that supposedly make you defecate your pants, but i highly doubt that this tone exists.
There may be discomfort caused at high decibels at low frequencies, but you're more at risk to loosing your hearing than you are to getting sick and vomit from low frequencies. I should know, I've had several ported systems tuned to around 20hz and hit those notes at over 125dB and had no ill-effects nor did my passengers over the years.