Sorry to say this John but I don't think Max has a lot of choice about what is put up.
He does up to a point. The Adsense website says:

You can block ads from the following categories:

    * Cosmetic procedures and surgery: Includes lifts, suctions, lasers, hair removal and restoration, tattoos and body modification.
    * Dating: Includes dating services and online dating communities.
    * Drugs and supplements: Includes pharmaceuticals, vitamins, supplements and related retailers; does not include resources providing information about drugs.
    * Get rich quick: Schemes promising fast earning.
    * Politics: Includes politics or controversial social issues; does not include ads for news organisations that are not generally associated with a partisan viewpoint on issues.
    * Religion: Includes religious ads and ads advocating for or against religious views; does not include astrology or non-denominational spirituality.
    * Ringtones and downloadables: Mobile add-ons including ringtones and other downloadable goodies such as screensavers and wallpapers for desktop PCs and profile layouts and graphics for social networks.
    * Sexual and reproductive health: Includes sexual function and fertility ads; does not include normal pregnancy resources.
    * References to sex & sexuality: Includes ads that are sexually suggestive, ads relating to sexual and reproductive health and ads that refer to sex and sexuality.
    * Video games (casual and online): Includes video games, online games and downloadable games; does not include video game consoles.
    * Weight loss: Includes weight loss, dieting and related products and programmes; doesn't include healthy eating or general fitness ads.

He can also block specific advertisers.