These reasons seem drawn from a very individualistic, modern perspective. From a historical, more community-driven perspective, it seems that two other major reasons would be:
You do not wish to “dilute” your value to your partner in some way. (Whether that be in terms of affection, economic impact, social status impact, parentage of a proportion of their children vs all of them, etc)
You believe a monogamous couple generally provides the best context for successfully raising your own children. (Whether that success be defined more in terms of the children’s life-outcomes, or more in terms of them being willing & able to care for you in old age, etc)
These reasons seem drawn from a very individualistic, modern perspective. From a historical, more community-driven perspective, it seems that two other major reasons would be:
You do not wish to “dilute” your value to your partner in some way. (Whether that be in terms of affection, economic impact, social status impact, parentage of a proportion of their children vs all of them, etc)
You believe a monogamous couple generally provides the best context for successfully raising your own children. (Whether that success be defined more in terms of the children’s life-outcomes, or more in terms of them being willing & able to care for you in old age, etc)