I love using them for porn. The recipe/ingredients change often here because EU rules on such things cause some substances to move into/out of legality quite often, it's like the peak of legal highs in that regard. It means some of the bottles are exceptionally good, some can be a bit crap. But as I build up use through a wank session, I can feel myself getting into the zone.
Disclaimer, of course: poppers are *not* healthy. They do mess up your lungs (and with COVID, this might not be the best thing to be doing on a regular basis). They do mess up your eye-sight (increasing studies have found rapid degeneration of eye-sight in homosexual men who use poppers regularly).
So as ever with any drug or substance - use sparingly, use carefully.