In the novel, love is unstable because it is always refracted through memory, grief, and power, and it rarely aligns with sex. Kristyna loves the student’s “tender timidity” and elevates platonic intimacy above physical consummation, fearing that sex will “lower their affair to the butcher’s or the mechanic’s level” (164). Instead, she values how he speaks about philosophy in a way that seems so foreign and mystical to a woman from a provincial town. She worries that physical intimacy will ruin her reverence of him. On the other hand, Tamina’s erotic life is framed by mourning. She imagines that if she undressed for a man, she would still be watched by her dead husband’s eyes. Later, on the island, her body discovers a dissociated pleasure while children examine “the quivering corners of her lips as if they were looking at a watch taken to pieces or a fly with torn-off wings” (244). This grotesque scene strips sexuality of reciprocity and meaning, while also denying Tamina agency over her sensations. These scenes show that love and sex diverge: Attachments can exist without sex, and sex can occur without love.

Desire in the novel exposes character motives and cultural cues, as their longings are shaped by history rather than individual will. The student’s awkward persistence as he “bravely” grasps Kristyna’s body even as her thighs stay closed dramatizes the clash between philosophical aspiration and physical urgency. Jan claims that rape belongs to eroticism while castration negates it, while Edwige insists that “eroticism as a whole is directed against women and it’s necessary to invent another kind” (288). Their debate exposes the misogynistic assumptions in cultural notions desire—especially in inherited images of taking and yielding—which the characters cannot easily shed even when they mock them. The novel also charts desire’s acceleration under prohibition. Kristyna lives in a world where abortion is “strictly forbidden,” and this further shapes desire by inflecting it with risk and shame that she finds appealing. Desire is thus depicted as scripted rather than spontaneous, and those scripts reflect the  historical and political world of the characters.

Eroticism is the narrator’s most explicit tool for total portraiture. He insists that bodies are not the hidden remainder of character but one of its principal texts. The novel’s portrayal of sexual relationships that operate beyond expectations and morality reflect its refusal to be bound by social conventions. The question of consent in sexual relationships, for example, is frequently left vague, with characters such as Tamina finding themselves in undesired sexual situations. Tamina does not refuse sex with Hugo, but the question of whether she desires to have sex with him gets lost in the eroticism of the moment, as Hugo’s physical actions and bad breath are contrasted with the complexity of Tamina’s grieving. Tamina finds herself in a similar situation later in the novel when she is subjected to the prying hands of the children on the island. They are fascinated by her body in a nonsexual, prepubescent manner. This is not sex as Tamina understands it, but she nevertheless allows the children to touch her. The depiction of the orgy Jan attends in the final story highlights how sexual encounters can collapse into absurdity: Jan is not able to enjoy himself or express his desire, while the prose describes the mechanics of sex in such meticulous detail that the narrator—like Jan—takes no pleasure from the situation. Taken together, eroticism and sex in the novel reflect how power enters even private life.