A scam invented by bathroom companies to sell more bathrooms.

A thing that some people do not have and can request from people as a joke.

Another thing humans just HAD to overcomplicate

A lie made by bathroom companies to sell more bathrooms

The most confusing made-up social construct in humans,

A social construct that was made to sell dishwashers.

Gender is the range of characteristics pertaining to, and differentiating between, masculinity and femininity. Depending on the context, these characteristics may include biological sex (i.e., the state of being male, female, or an intersex variation), sex-based social structures (i.e., gender roles), or gender identity. Traditionally, people who identify as men or women or use masculine or feminine gender pronouns are using a system of gender binary whereas those who exist outside these groups fall under the umbrella terms non-binary or genderqueer. Some cultures have specific gender roles that are distinct from "man" and "woman," such as the hijras of South Asia. These are often referred to as third genders.

(source: Wikipedia)