Those of us who, like me, are fed up with ISPs such as Tiscali who distribute dozens of these e-mails every week, merely delete any obvious unwanted e-mails.
Tiscali can stop such e-mails from reaching you but has the audacity to charge you for the service, even though it distributes the e-mails itself.
My other ISP, Pipex, has only sent one such e-mail in eight years and promptly acted when I complained about it.
I don't use Outlook - it's more business orientated than Outlook Express - but OE does have Message Rules and you could try configuring it to deal with such e-mails using a variety of words such as XXX, sex etc.
However, the senders of such e-mails constantly change their approach so it is difficult to keep on top of the situation.