It's common for actors to get aroused while filming sex scenes, and it can put an entire production on hold
Briefly

Thackeray explained that during sex scenes, a time-out could be called for a number of reasons, including choreography that's gone off course, a modesty garment that has come undone, or arousal.
We just make 'it really clear that's normal and that the worst thing you can do is carry on,' Thackeray said. 'So we call that a time-out. Give them five minutes...Then we come back into it when they're ready.'
Read at Business Insider
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