Characters have sex in this story, but it's not porny or explicit. There is a moment where the singlet (who's faking multiplicity) pretends to switch during sex, only to then have her ostensible headmate reinitiate sex with her multi boyfriend, only for it later to come out that he knew all along that she was faking. So obviously this isn't the healthiest relationship.

The main character wants to be multiple so badly that she undergoes experimental therapy to induce it, but it doesn't take. She returns to singlethood over the course of a few weeks. Also, squicky depiction of headmates of different ethnicities.