Original sentence: Current trends in psychology hold that heterosexuality and homosexuality may exist on a continuum rather than as discrete entities.Given the tension between the biological definition of heterosexuality and the modern psychological definition of heterosexuality, political and sociological discussions of the subject are often difficult.However, many modern psychologists hold that sexuality in humans is a larger term than originally though, encompassing more complex behaviors.In the animal kingdom, the vast majority of sexual reproduction, results from heterosexual coitus between sexually mature partners.Thus, views on heterosexuality are divided among those who hold that heterosexuality is a concrete idea of attraction towards the opposite sex, versus those that hold that heterosexuality is more fluid
Edited sentence: Further complexities are explained in the article Homosexuality and transgender.Heteronormativity deals with a similar notion of bias, both conscious and unconscious.However, heterosexualism (not heterosexuality) is also used in a different sense, to refer to heterosexism (the idea that heterosexuality is superior or normal).However, the realm of sexuality far exceeds that of reproduction alone.In the mammal family, sexual reproduction, a major function of sexuality, generally results from heterosexual coitus between sexually mature partners.Some people even find the notion of distinct genders (and distinct sexual orientations based upon them) to be offensive.The boundary-drawing problem between heterosexuality and bisexuality is discussed in the article sexual orientation.The complexities of sex and gender are explained in the article on sex.These definitions are complicated by the fact that there are several different biological and psychosocial components to sex and gender, and a given person may not cleanly fit into a particular category