I don't understand people who are married, yet still flirt with other women. Some are even public / religious figures. Mind boggling.

Marriage means that we have committed ourselves to our wife. There'd be  no other, and no acts like :

# Saying how pretty or sexy that woman is.
# Getting too friendly with another woman.
# Complaining about / humiliate our wife to other woman.
# etc

Treat women with respect & dignity. They're not objects to be played around with, even when some seems willing. Resist the temptation.