According to the document, 40% of spouses/partners are unfaithful. The document provides a checklist of potential signs that a partner may be having an affair, including never letting their cell phone out of sight, erasing messages and calls, increased computer use with private passwords, wearing cologne or perfume, taking frequent trips with friends, reduced sexual activities, and spending more time at work. The document advises that if a partner exhibits these behaviors, it may be time to investigate further with a private investigator.