The other reason people cheat is lack of sexual satisfaction. If you are not satisfied in the bedroom, you may look for that satisfaction elsewhere.

For a lot of people, the lack of sexual satisfaction can be boiled down to lack of novelty. For some it could be not being able to orgasm during sex. Or it could be that the sex is not exciting enough for them.

As relationships progress, the sexual excitement is likely to diminish and people can start craving the excitement that comes with a new sexual relationship.

Dr. Alicia Walker of Missouri State University studied many women who secretly had extra marital affairs using an online portal. These women specifically vetted the online profiles for a sexual partner, rather than emotional partner.