WebsiteSecure.org has inspected and certified join pages for many companies in mainstream and adult. Cross-sale is much too broad a term. A clearly stated cross-sale unchecked or perchecked, above the submit button is 100% ethical. However there are a lot of sites that aren't doing that.
The worst cross sales I see these days are on mainstream sites. One actually had a cross sale stated in their TOS page to begin 90 days after a member cancels and thought a link to their TOS above the submit button was sufficient.
There is a lot of money to be made with ethical cross sales that add value for the consumer. The best ones I've seen include a legitimate discount price on another relevant site as a value added offer.
If anyone running ethical cross sales wants to improve their ratios by having their sites certified, be sure to contact me.
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