I had exactly the same problem with a site I made for a friend's wedding. It included a short message from the bride and groom ending with 'xxx' — i.e. kiss kis

I had exactly the same problem with a site I made for a friend's wedding. It included a short message from the bride and groom ending with 'xxx' — i.e. kiss kiss kiss. Vodafone UK (at least) blocked it as porn.