There's some kind of plastic or fabric covering, I don't think that's a condom or the texture of his balls.
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Anyway, you can tell just from the way the whole thing is shot that it's simulated sex. The angles, when they cut away, the fact that every time there's full frontal nudity they are flaccid. That's what simulated sex scenes look like. If it was unsimulated there wouldn't be such a care to imply that more is going on while hiding the actual penetration, stroking, fingering, etc. just out of frame.
I understand the drive to try to find hot unsimulated content in movies and TV, but I think a lot of it is wishful thinking. The reality is that it's super rare and filmmakers are increasingly apt at making explicit sex scenes without involving their actors in real sexual activity, especially now with prosthetics and digital composition/AI. Unless you're shooting porn or trying to provoke or make a point about eroticism, anyone who's ever been on a film set could tell you - with lighting adjustments, and camera resets, and doing many takes, and keeping up with the dialogue - it's a lot easier for everyone involved to have them pretend instead of actually fucking.