Cheating husbands and cheating wives only need to go online for tips on having an affair. Type "affair tips" in to any search engine and you'll have all you need to have an affair.The following is from one of the sites all about making sure you don't get caught cheating. Sign up for new Hotmail or Gmail account. Rent a yourself a P.O. Box. Get a no-contract cell phone. If you need mailing address…