As for collaboration - I have done a lot, 26 books, and found publishers increasingly resistive to them. It's not that the books are bad; editors won't even read them.
Piers AnthonyWhen I started writing this, I found that I simply couldn't take fantasy seriously, so it became humorous, and continued from there.
Piers AnthonyIn fact, I believe that we need better sex education in our own culture, here in America, so that young folk learn about things like venereal disease before they encounter it.
Piers AnthonyBink knew the dolphin only from old pictures; it was a kind of magic fish that breathed air instead of water.
Piers Anthony