Me and my curious mind decided to research scientifically whether humans were really meant to get married, settle down, and have kids. For me, I knew that was bulllshit but I just wanted the proof. Here I'll share my findings:

From the Huffington Post

There are three types of monogamy scientists now refer to based on their animal studies.

Sexual monogamy: the practice of having sex with only one mate at a time. Social monogamy: when animals form pairs to mate and raise their offspring but still have flings on the side (“extra-pair copulation” in science talk). Genetic Monogamy: when DNA testing confirms that a female’s offspring all come from one father. For us human beings, social and sexual monogamy generally go together. But not always in other species. Studies now estimate that 90 percent of all birds are socially monogamous, living and raising young together but frequently having sex with other partners.

As scientists continue to uncover clues about why certain animals stay loyal to a partner, the underlying reason for monogamy remains an open question. The most commonly accepted explanation is that monogamy evolved in situations where young are more likely to survive if both parents are involved in raising them. This might help explain why humans tend to be monogamous; human children do take a long time to mature.

By nature it seems that humans are naturally polygamous. Although polyandry, a marriage of one woman to many men, is rare, polygyny, the marriage of one man to many women, is widely practiced in human societies. Humans, in fact, possess certain characteristics typical of non-monogamous species. Monogamous species are also monomorphic, meaning that both males and females are the same size. Polygamous species are dimorphic: the male is larger than the female. Guess what comes next. Human males are typically 10 percent taller and 20 percent heavier than females, and it seems that humans have been mildly polygamous throughout history.

And there it is. Humans are NOT meant to have one partner throughout their life. It is not key to the survival of the offspring (Single mothers, although you can argue the kids are fucked up without a father figure).

From Livescience:

Are Humans Meant to Be Monogamous? Are people meant to be monogamous or is it an outdated societal expectation?

Only 3 percent to 5 percent of the roughly 5,000 species of mammals (including humans) are known to form lifelong, monogamous bonds , with the loyal superstars including beavers, wolves and some bats.

Social monogamy is a term referring to creatures that pair up to mate and raise offspring but still have flings. Sexually monogamous pairs mate with only with one partner. So a cheating husband who detours for a romantic romp yet returns home in time to tuck in the kids at night would be considered socially monogamous.

Beyond that, scientists' definitions for monogamy vary.

Evolutionary psychologists have suggested that men are more likely to have extramarital sex, partially due to the male urge to "spread genes" by broadcasting sperm. Both males and females, these scientists say, try to up their evolutionary progress by seeking out high-quality mates, albeit in different ways.

The committed partnership between a man and a woman evolved, some say, for the well-being of children.

"The human species has evolved to make commitments between males and females in regards to raising their offspring, so this is a bond," said Jane Lancaster, an evolutionary anthropologist at the University of New Mexico. "However that bond can fit into all kinds of marriage patterns – polygyny, single parenthood, monogamy."

The human species is somewhat unique amongst mammals in that fathers do invest in raising children .

"We do know that in humans we do have this pretty strong pair bond, and there's more paternal investment than in most other primates," said Daniel Kruger, a social and evolutionary psychologist at the University of Michigan's School of Public Health. "We're special in this regard, but at the same time like most mammals, we are a polygynous species." Kruger said humans are considered "mildly polygynous," in which a male mates with more than one female.

There's a common trend. We are polygamous by nature, to seek out the best mate, but we are supposed to raise offspring together. Thus the reason why single mothers have children with various conditions such as daddy issues, instability, etc.