Dr. Liat Yakir, a scientist who has a Ph.D. from the Molecular Genetics Department at the Weizmann Institute of Science in Rehovot, considers how people develop affection for one another in her talk on romance.
She starts out my comparing humans to other mammals, and shows that being monogamous is rather unnatural, and extremely rare in nature. She says that monogamy tends to be dictated by the needs of the offspring, which sometimes means that males and females form a close bond to keep their young safe. Yakir continues by considering the love hormone preceptor an how it develops, with an example being how it helps to form mother to offspring attachment.
Throughout her talk on romance, Yakir shows that monogamy often doesn't play out how people often might expect it to, and that the definitions for family and love need to evolve with the progression of humanity which has surpassed dated gender roles.
In Her Talk on Romance, Dr. Liat Yakir Considers Human Nature