Goji Berries are pretty damn sweet. They don't taste sweet, but their health benefits are huge. I swear to you that last winter they were a definite help in overcoming some lifting plateaus since they were the only new variable in my life.
I'd also put them ahead of Oysters, Asparagus, Chocolate, or Bananas for a libido booster. Maybe not Oysters. I've really never had them so I wouldn't know.