Excellent article, well written. It combines a literature review with some case reports so that it can expand a little bit about what has been already written.
They play it very safe, but they do deserve a mention for their effort in bringing new data. I appreciate that they did not fall into the pure "allergy to semen" trap, and are conscious that POIS is much more complex than that.
I am also glad that they agree with my view that there are many subtypes of POIS:
"It is likely that the diagnosis of POIS captures a variety of conditions with different mechanisms, and we advocate for treatment targeting both physical and psychological substrates, paying attention to individual variations in symptom profiles when choosing treatment."