24 minutes in episode 1 of season 1, Luke Treadaway is getting naked to go into a sauna. We see his butt as he removes the towel around his waist. The cameras stays on him and we can admire his great body in the sauna. Then when a woman enters into the sauna, Luke covers his genitals with his hand. While he does, there is one frame where we can see his nick and big uncut dick.
In episode 2, we get a quick view at Aaron McCusker's uncut penis as he walks naked into a kitchen.