There are products related to affairs. The most common ones are gas, eating out, hygiene, flowers, clothing, and hotels. If you think about dating, you have to spend money on gas or transportation. You will often see an increase in gas and transport expenses when an affair starts. Dining out is a big part of dating as well. When an affair starts (most likely with men) there will be increased spending on dining out. Does your man suddenly have an OpenTable.com account? Maybe something else is going on! Does your lover suddenly feel the need to spend money on taking care of themselves? This can be a sign that something else is going on as well. Look out for increased expenditure on deodorants, colognes, perfumes, scented soaps, manicure kits, pedicure kits, scented lotions, and makeup. Look out for retail purchases from department stores. Your cheating lover might be looking for new outfits to impress their new lovers with. Finally, keep an eye out for hotel expenses. Your lover might be smart enough not to charge a hotel room to their card, but someone has to provide cards for the hotel incidentals.