why after marriage also some like to have extramarital affairs?

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what i think is they r not happy with his/her partner.they look for some good,better and best things from outher partners. HAPPY IN SENCE. 1)not happy with X 2)no respect for each other 3)non of them is not earning 4)no kid 5)for passion 6)if one of them r ill 7)using slang words 8)previous love