Editing Human behavior (section)

=== Interpersonal relationships ===
{{Main|Interpersonal relationship}}
[[File:Inupiat Family from Noatak, Alaska, 1929, Edward S. Curtis (restored).jpg|left|thumb|A family in [[Noatak, Alaska|Noatak]], Alaska (1929)]]
Interpersonal relationships can be evaluated by the specific choices and emotions between two individuals, or they can be evaluated by the broader societal context of how such a relationship is expected to function. Relationships are developed through communication, which creates intimacy, expresses emotions, and develops identity.{{Sfn|Duck|2007|pp=10–14}} An individual's interpersonal relationships form a [[social group]] in which individuals all communicate and socialize with one another, and these social groups are connected by additional relationships. Human social behavior is affected not only by individual relationships, but also by how behaviors in one relationship may affect others.{{Sfn|Duck|2007|p=107}} Individuals that actively seek out social interactions are [[Extraversion and introversion|extraverts]], and those that do not are introverts.<ref>{{Cite journal |last1=Argyle |first1=Michael |last2=Lu |first2=Luo |date=1990-01-01 |title=The happiness of extraverts |url=https://dx.doi.org/10.1016/0191-8869%2890%2990128-E |journal=Personality and Individual Differences |volume=11 |issue=10 |pages=1011–1017 |doi=10.1016/0191-8869(90)90128-E |issn=0191-8869|url-access=subscription }}</ref>

[[Romance (love)|Romantic love]] is a significant [[interpersonal attraction]] toward another. Its nature varies by culture, but it is often contingent on gender, occurring in conjunction with [[sexual attraction]] and [[sexual orientation]] and [[romantic orientation]]. It takes different forms and is associated with many individual emotions. Many cultures place a higher emphasis on romantic love than other forms of interpersonal attraction. [[Marriage]] is a union between two people, though whether it is associated with romantic love is dependent on the culture.{{Sfn|Duck|2007|pp=56–60}} Individuals that are closely related by [[consanguinity]] form a [[family]]. There are many variations on family structures that may include parents and children as well as [[stepchild]]ren or extended relatives.{{Sfn|Duck|2007|pp=121–125}} Family units with [[children]] emphasize [[parenting]], in which parents engage in a high level of [[parental investment]] to protect and instruct children as they develop over a period of time longer than that of most other mammals.<ref>{{Cite journal |last1=Geary |first1=David C. |last2=Flinn |first2=Mark V. |date=2001 |title=Evolution of Human Parental Behavior and the Human Family |url=http://www.tandfonline.com/doi/abs/10.1080/15295192.2001.9681209 |journal=Parenting |language=en |volume=1 |issue=1–2 |pages=5–61 |doi=10.1080/15295192.2001.9681209 |s2cid=15440367 |issn=1529-5192|url-access=subscription }}</ref>