Answer:
I am heavy forward but backward I'm not.
I'm sometimes white but most often I'm black. I take you there but never bring you back.
I row quickly with four oars but never comes out from under my own roof.
A necessity to some a treasure to many I'm best enjoyed among pleasant company. Some like me hot some like me cold. Some prefer mild some like me bold.
I am long and slim works in light. Has but one eye and an awful bite.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?