I’m finishing off Grant’s Augustus to Constantine. He says:
On the other hand, an ascetic view was encouraged by conflict with licentious Gnostics, by opposition to popular slanders about Christian promiscuity, and by the penalty of stupratio sometimes imposed upon Christian women by Roman judges.
for which he references one F. Augar in Texte und Untersuchungen (Gebhardt & Harnack, eds)
So … what’s stupratio?