Pheromones

"I feel fine," Daniel protested as Dr. Fraiser set his blood sample in the sequencer beside the blackened remains of whatever had been in Hathor's hot tub.

Carter read the output. "It matches Dr. Jackson's DNA. There are no traces of alien biochemistry."

"How did you know it was mine?" he asked.

Sam frowned. "They remember, they forget - what's going on?"

Janet shone a penlight in Daniel's eye. "I suspect Hathor's pheromones interfere with long-term memory formation. It's possible none of them will remember a thing."

"You know what this means," Sam said. "No commendations for the ladies after all."