10 Scientific Facts As To Why People Cheat

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Last year, in 2015, a massive data leak on the adulterous website Ashley Madison revealed the names and personal details of thousands of people cheating on their spouses. This caused many people to think twice about what was going on when they weren’t around their significant other. This leak also forced research studies and scientists to fully explore cheating and why people cheat during their relationships. Cheating is probably one of the most significant reasons why a couple ends their relationship, and it is also the main plot line for so many romantic movies. Here are ten scientific facts as to why people romantically cheat.

Happy Hormone

Every person has differences within their “happy hormone,” which will affect their likelihood to cheat on their significant other or not. Dopamine floods into our system when we have sex with new people, which causes intense feelings of reward in most people.

Polygamous Mammals

Believe it or not, only 3 percent of mammals are actually monogamous – humans are within that group, for the most part. Most species of primates, for example, do not remain with the same partner for life.

Social Media Cheating

The influx of social media networks actually correlate with cheating. Facebook, Instagram, and Twitter, actually help people reconnect with old lovers or meet new people, increasing the likelihood of cheating to occur.

Bigger Testicles

According to scienctists, males who develop larger testicles tend to store more sperm and want to mate far more frequently with females. This has been known to cause excessive cheating or sleeping around.


Recent studies have revealed that monogamy evolved within primates because of infanticide, where foreign males would kill the infants and take the females. Infanticide is rare these days, and people are more likely to remain with their partner in a single pair.

Cuddle Hormones

It is safe to say that many hormones within the body cause cheating to occur. The hormone released during cuddle, for example, helps us form a bond with our significant other. People with lower levels of this hormone are more likely to seek it from other partners.

Married People

Sadly, most married people will cheat during their lifetime. Around 50 percent of married women and 60 percent of married men will have an affair at some point. This is double the amount from a single decade ago.

Deep Voice

Men with a deep voice are more likely to be accused of cheating by their women. Similarly, men who are dating a women with a high-pitched voice tend to feel they are cheating. Of course, they may not be at all.


Cheating actually does not mean that an individual is unhappy with their current relationship. In fact, most men and women reported being very happy with their current significant other, despite having cheated.


According to studies, women who are ovulating tend to cheat more often than women who are not. Ovulation means they are highly fertile, which causes attraction to other men besides the partner.