Sex and the Sistani

Last week a few bloggers (see Marc Cooper; Kaus) noted with a snicker that Grand Ayatollah Sayyid Ali Husaini Sistani in Iraq has a website which, among other things, dispenses rather specific advice on which sex acts are permissable under the Ayatollah’s view of Islam.
Two noted examples of the Ayatollah’s Dr. Ruth-like pronouncements were the following Q and A’s:
Question: My question is, what does the holy book Quran and prophet Mohammad (pbuh) say about anal sex even if the wife agrees to experience this with her husband?
Answer: As deduced from narration anal sex is permissible; but it is strongly undesirable. Permission is bound to wife