What tree smells like semen?

The tree that is commonly noted for its semen-like smell is the Ginkgo biloba, specifically the female trees. When the female ginkgo trees produce seeds, they release a pungent odor reminiscent of rancid butter or semen, which can be quite offensive to some people. This smell comes from the fleshy outer layer of the seeds, which contains butyric acid. As a result, many people prefer to plant male ginkgo trees to avoid this odor.