Coup By Clam
The crew gets checked out by a doctor for Space Madness, a condition that's common in the area they're traveling. He gives them some food after the exam, and after they've ingested the meal, tells them the meal will cause them to get linked with whomever they split the dish with. D'Argo/Noranti, Aeryn/Rygel, and Crichton/Sikozu. He'll cure them... for a price.