If you were a Roman or Greek, you likely associated spring fertility rites with the worship of a god with a particularly problematic member. Priapus (yes, the medical term of "priapism," which refers to the problem of having a constant erection, comes from him) was one of the most notable fertility gods in history, because of his tendency to be depicted with a penis almost as big as himself. Understandably, he was associated with fecundity, good crops and bountiful harvests.