Hi, nice post! leaving here my grain of sand of this subject:

Usually we men are afraid of being with just one partner for the conditioning that society has inculcated in us of being a party boy and so on. Besides, commitment, having goals, wanting to accomplish sometime in life is a difficult path, going from party to party, having tons of girls, not doing anything with your life and focusing on making money to spend it in trivial thing is easier so, the mind tends to go for the easier path.
Regards!