Swedish botanists Anders Wennstrom and Lars Ericson have studied other kinds of flower fungi, including some that make their way from a bloom into the soil, where they can infect another generation of plants the following year. And certain fungal parasites are passed from the flowers of one plant to the seeds, leaves, or stems of another. But since the pathways of these infections don’t require that both plants have sexual organs, it’s not clear that they should be categorized as sexually transmitted, per se. The researchers suggest that they be called reproductive diseases instead.