Prometheus Bound Steaminess Rating
All right, so we get some hints here and there about how Zeus wanted to get it on with Io, before transforming her into a cow. When Prometheus finally gets around to explaining how they're going to get busy, however, he says that Zeus will make her pregnant only by touching her with his hands.
Aside from that, Prometheus Bound is mainly the spectacle of some really loud angry guy chained to a rock for two hours. Not much sex to speak of here.