is does NOT breach their guidelines.
this is from their web site:-
Prohibited goods (that is, goods which are banned completely).
Indecent and obscene material featuring children, such as books, magazines, films, videotapes, laser discs and software.
Pornographic material other than that which depicts the type of consensual sexual activity between adults which can be legally purchased in the UK...
anal and dp are entirely legal to purchase, under the current interpretation of the oba, so what's the problem? i'd ask them to explain the basis for their statement to you, because it sounds completely bogus.