What's Tom Robbins So Happy About?

I came across this old copy of Jitterbug Perfume in a box of books to be shelved.  I found the author photo to be, um, unusual.  Tom sure looks happy in this picture.  Then again, he was riding high on the bestseller lists, so he undoubtedly had a lot to smile about.  Maybe one of the things he was smiling about was knowing that Bantam would be printing this photo on the back cover of his soon-to-be-published book.