Got My Client Off During A Workout Session

Hey there, so I'm a personal trainer and today was one of those weird days. Me and this guy, let's call him Jake, we've been working out together for a while now. We joke around like brothers but it’s always kept professional until yesterday when things got... heated. We were doing some strength training and the way he was panting, the intensity in his eyes, it just pushed me over the edge. Before I knew it, my hands were roaming a bit too much during stretches. He ended up getting off right there on the gym mat, laughing and apologizing afterward but telling me it was all consensual and unexpected fun. So here's my question: how often does something like this happen to you guys?