1. Indiscipline

2. Emotional Entanglement most times from Pity for a Vulnerable woman.

3. Curiosity and weird imaginations

Let me explain in detail...

Indiscipline because most of us men were raised by fathers who believed that it's a man's world and men can get away with sexual indiscipline. We are somehow products of patriarchy. That's why men raised by exposed women better behave with the opposite sex than most of us raised by traditional men.

The second most popular reason why most GOOD men cheat is very tricky... Men are wired to protect, provide and lead. If a man gets close to a Vulnerable woman, he could be tempted to provide for her, protect her and lead her. This leads to an emotional Entanglement which usually grows into an affair. Most GOOD men end up in emotional Entanglements while trying to help.
This is why I said it is very tricky...
Most honest and responsible men who got into an affair can agree that they weren't trying to cure their high libido. No. They thought they were strong enough to resist temptations but they didn't know the magnetic power of a woman in tears. It goes from wiping her tears to wiping 'other things.'

And lastly, curiosity and weird imaginations... Men are curious beings. Men are also imaginative. The imaginations of a man can either take him to the bedroom or take him to the boardroom. It is out of curiosity and imagination that a man would pay for a first-class flight ticket to import a Brazilian girl from Brazil to have ....read more https://www.marketgists.com/three-major-reasons-why-men-cheat