When conducting an affair beware of smells.  I know as a women smells for me are a huge determiner of how I feel about a person.  Pheromones really can make or break an encounter.  If your nose is telling you no than more than likely take its advice.  Now also on the note of smells beware of perfumes, colognes, oils etc… Your spouse know your smell and the normal smells of the house and your car.  If you come home smelling different than you usually do or  your car smells different than that can be a big red flag that something is going on and you are going to get caught.  So for both you and your lover it might be a good idea to not wear any smells especially something that is going to get you or them caught.  So go with your nose, it knows.