Which of these is a sexual stereotype?

A stereotype is an inner image of an imaginary or actual group and its members, often in the form of simplified notions of the members' characteristics. A stereotype can, for example, have an ethnic, national, religious or gender-related connection.

Gender stereotypes reflect a normative view of women and men as well as of femininity and masculinity. These are usually presented as a dualism or as binary opposites. The characteristics of stereotypes vary between places, cultures and over time, as do all aspects of gender. These can also be positive and negative as well as being implicit or explicit. Despite this, these can still be linked to gender stereotypes, which can also be seen as limited. Stereotypes reduce and fix differences that prevent another varied thinking which in turn constructs the simple social categories such as "we" and "the others".

there are men and women, some choose to be both or change their gender. often times those people go by "other". those who change their gender are known as "transgender"