A person who is attracted to the opposite gender. Heterosexuality is the most common sexual orientation in the world (but by no means "normal". It is simply more common than some variations of human sexuality).

Only tiny minorities are exclusivly heterosexual or exlusively homosexual (somewhere between 2 to 5% each); most are somewhere in between those two extremes.

Slang terms for heterosexuials include straight.
Many (ignorant/prejudiced) heterosexuals like to abuse or try to change sexual minorities, like homosexuals (who love members of the same sex), bisexuals (who love both sexes), pansexuals (who are love anybody; male, female, intersex, whoever), and asexuals (who have no sexual desires whatsoever), and seem to believe that these people can become straight, despite that sexual orientation is pretty much fixed for life.

What causes heterosexuality? People always ask what causes pan-, bi-, a-, and homosexuality, but hardly question heterosexuality.
by Lorelili August 15, 2005
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"Dude I am so... heterosexual. I fuck bitches without rubbers."
"Well I'm so heterosexual that I have sex with the opposite sex."
by bestieto69 April 9, 2009
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It is a recognised illness in many countries. Highly contageous. People suffering from heterosexuality try to push their beliefs into normal people.
Person 1: "Marcus is not coming to school today, he has heterosexuality"
Person 2: "OMG I wish he gets normal soon, otherwise we will have to sacrifise that dirty breeder to satan"
Person 3:"Yeah let's do that now. He doesn't deserve basic human rights. Fucking hetero!"
by Izaroo December 20, 2020
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heterosexuality, a mental illness
noah beck has heterosexuality, i hope he gets treatment!
by noah becks skid mark September 5, 2020
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(of a person) sexually attracted to people of the opposite sex.
My dad is heterosexual
by YouGotCoconutMalled January 19, 2022
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is the act of liking pussy if ur a man or the acot of liking penis if ur a woman
heterosexuality is on the decline thx to faggot homos
by u stupid racist cunts December 20, 2021
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