In addition to the helmet guideline offered above... may I suggest a set of "Love Handles"?
Despite the flurry of sophomoric posting activity this statement may cause, I heartily recommend them for your comfort and well-being as well as your pillions. I use 'em and they are GREAT!
http://www.sportsbikeshop.co.uk/motorcycle_parts/content_prod/1820
Scroll down. You get the idea. I bought mine on eBay.
Cheers,
Ian