I originally quoted from the 1st edition of this book.
I do have a revised 2006 edition of the book also, and after looking at it, Mr. West does change his stance on anal penetration, but not as firmly as some might think. He basically sums up the question by saying, “Perhaps in some abstract, objective sense there is nothing to condemn mere penetration of the anus as absolutely and in every case immoral. But subjectively speaking, for all of the above reasons it is very difficult to justify anal penetration as a loving act of foreplay to the marriage embrace. It is an act that seems to stem much from the disorder of lust than from a genuine desire to symbolize and renew the marriage commitment.”
So, it appears he does change is position, but still leaves the window open just a bit.