To seal travertine or not to seal?

I have read several postings about using travertine in bathrooms.  I am planning on remodeling my bathroom and using travertine in the shower and on the floor of my bathroom.  I am very confused about the issue of sealing.  Some postings suggest not sealing yet I have been told it is very important to use a sealer to prevent it from taking water and to make it easier to  maintain.  I have also heard that certain finishes don't require to be sealed such as a hone-finished, is this true?  Can anyone explain their point of why you would and would not seal travertine in bathrooms???  Thanks!