Sex
You might be thinking that this is about an allergy to latex, a common material used in condoms. But this is actually about an even stranger condition—people who develop an immune overreaction to semen. Known as semen allergy or seminal plasma hypersensitivity, the culprit is likely due to proteins in the semen, not the sperm themselves. The condition can be managed through sticking to protected sex. But in at least one case study, doctors did seem to desensitize the woman’s reaction by first exposing her vagina to her partner’s semen, then prescribing a regular dose of sex to the couple every 48 hours.
