Modern life is making it easier for people to have affairs, according to a woman who has written a book on the subject.
Sarah Strudwick, author of Infidelity Unwrapped, said that most people are unaware of whether their husband, wife or partner is cheating because they lack the information, are ignorant or belief them when they deny it.
She said that the changing roles of men and women in society is causing angst and causing some people to stray because they cannot express their feelings.
Ms Strudwick said: "We live in a confusing society where roles are changing and pretty much anything goes, where men have become confused about their role in relationships, resulting in communication breakdowns and lack of intimacy.
"We live in a throwaway society where marriage and long-term relationships are considered unimportant, and cheating is commonplace."
She added that people are not able to catch a cheating spouse because they do not have the "right tools" to do so and is hoping her book can help.
Websites designed specifically to target those who want to have extramarital affairs are on the increase, making it easier for people to find them.
She said: "Men visited sex workers long before the Internet, through the use of contact magazines and local newspapers. However, with a growing number of escorts having their own web sites."