I didn't see anything particularly actionable in that paper, but I just skimmed it.
For me, orgasm seems to give me an endorphin rush - which then leads to POIS. Anything physically stimulating or mentally stimulating does the same - endorphin rush which leads to 'POIS' type episode, although a lesser one. Some of the POIS and CFS/ME symptoms seem to overlap, and I wouldn't be surprised if they were related disorders at the least.