A report out that oysters and other such bivalves really are aphrodisiacs. Perhaps, but this line worries me:

Dr Fisher and his team, partly funded by the United States National
Institutes of Health, bought samples of bivalve molluscs – which also
include mussels and clams – from fish markets near Dr D’Aniello’s
Naples laboratory.

Now one of the methods of growing mussels in Naples is to lift up a manhole cover, tie a rope seeded with spawn to the underside and replace the cover. Come back a few weeks later and great big juicy shellfish, grown big and strong by filtering the sewage. Might indeed be an aphrodisiac , also a great source of cholera and typhoid, both known to decrease the incidence of sexual activity.