the sense of balance huh? Yeah that sounds pretty resonable, but i think that applies to your sense of touch. When you feel more pressure onf a certain side of your body, usually your foot you tend to equalize the pressure subconciously to allow your body to equally distribute this pressure. This keeps you balance and upright. I dunno. That's just my idea of balance.
As for 6th 7th and 8th senses, this is all based on your view of the paranormal. Some people these other senses can be the ability to see the after life, see the future, telekineses, esp, teleportation, levitation blah blah blah blah blah, the list the keeps going on. It just how you perceive it. Scientifically there are no more than 5 senses.
As for comic's 6th sense. I sometimes experiance that myself but i believe everyone does. Everyone can sense when there is something wrong, or something bad is going to happen it's natural and I doubt it just present in all woman and a few men. It has all to do with your subconcious. Going through the day in the same place over and over again gives your mind a sense of familiarity. This is based on your sense of smell, sight, touch, hear, and taste. When you feel something is wrong is usually based on your sense of sight, or hearing. Usually when you may not perceive it, you subconcious tells when something is wrong.
For instance lets say you all walking down a hallway in your school, you looking around saying hi to your friends, socializing. Suddenly you get a sense of paranoa, somethings wrong. This can be because there's a slight change in your atmosphere, like someone is watching you, or the idea that people are looking away or not looking at you doesn't seem right since you are not familiar with this. This gives you the sense of something being wrong, not the paranormal.