In 1978, a team of scientists succeeded in proving that “vaginal malodor” among women using the contraceptive sponge is caused by sperm—specifically, the components sperm breaks down into after having been killed by spermicide. That’s the interesting part. The funny part, as pointed out by blogger Scicurious, is imagining the awkward lives of the grad students involved in this study. Money quote: “Hey, go put this is in, get it on, and come back immediately, please, we’ll need that spunk.”