How many of you know men that have two families, one 'proper' i.e, married to wife with children and another family with a woman with 3/4 children? What do you think motivates a woman to have children with a man that will not marry her?

I think it's illiteracy and lack of intelligence

there are many reasons why a man/woman would do such thing. i guess the person doesnt get what he needs with one family so he had to go elsewhere to find what he desires. its definitely not right but since communication is long gone in many marriages of today, spouses tend to just go and make things happen for themselves. i know married guys who got mistresses to get away from the nagging wife at home and have some PEACE time with someone. i know others who just like to "give" but their wives didnt have time to "receive".
who are we to know what goes in the mind of married people cheating on their spouses?!
the bottom line is there was a lack/void that this second family filled, i guess.
some women dont view happiness with marriage/ring/the little house etc. they believe in LOVE and this can happen with anybody, married or not. so if the single woman fall in love with a married man that tells her that he is not happy at home and want to divorce his wife or whatever, then this single woman will have a relationship with this married man hoping for the day that he will leave his family and come to hers, which mostly never happens. by the time the single woman realize, she has already had 2/3children by this married man and cant let go.