Dutch researchers have said that the illness, known as post orgasmic illness syndrome or POIS, manifests itself in the form of fever, runny nose, extreme fatigue and burning eyes.
The conditions come on straight after climax and can last up to a week.
Marcel Waldinger, professor of sexual psychopharmacology at Utrecht University in the Netherlands, said a treatment known as hyposensitisation therapy can help reduce the impact of the syndrome, reports the Sun.
It involves being repeatedly exposed to small but gradually increasing amounts of the allergen over several years to build up resistance.
He said, "These results are a very important breakthrough in the research of this syndrome." (ANI)