The sex

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Organisms of many species are specialized into male and female varieties, each known as a sex. The gametes produced by an organism define its sex: males produce small gametes e. Individual organisms which produce both male and female gametes are termed hermaphroditic. Physical differences are often associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience. For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes. Among humans and other mammals , males typically carry an X and a Y chromosome XY , whereas females typically carry two X chromosomes XX , which are a part of the XY sex-determination system.
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We split up and got back together – but the sex isn't great

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Sex - Wikipedia

My husband had an affair and, after we split up, I also had another partner. Now we are reconciled, but it still seems to be affecting us. My husband and I have been married for almost eight years. In , after a period in which we rarely had sex , he went behind my back and starting seeing another woman. This led us to split and, shortly after, I found a temporary partner as well.
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The Sex/Gender/Sexuality System

A sex chromosome is a type of chromosome that participates in sex determination. Humans and most other mammals have two sex chromosomes, the X and the Y. Females have two X chromosomes in their cells, while males have both X and a Y chromosomes in their cells.
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In our heteronormative culture, everyone is assumed to be heterosexual attracted to men if you are a woman; attracted to women if you are a man until stated otherwise. People make assumptions about how others should act in social life, and to whom they should be attracted, based on their perceptions of outward bodily appearance, which is assumed to represent biological sex characteristics chromosomes, hormones, secondary sex characteristics and genitalia. Rubin questioned the biological determinist argument that suggested all people assigned female at birth will identify as women and be attracted to men. However, this view fails to account for human intervention.
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