Met a former client in the gym

Hi guys,

I figured out I go to the same gym as my former client. Upon bumping into him, he texted me that he could use some more sessions (last time I saw him it was like 2 years ago). However I am male and we do go to the same gym, and he's gay so I thought what if we end up in the shower or the locker room with me being naked.

What would be the code of ethics here please? I will ask my supervisor in 2 weeks but wanted to pick your brain in the meantime