Exactly, you really want to avoid to send a current through or near the heart, even if you see it done in porn.
The risk is of course higher if you have heart problems already, but it is not zero without and there is always a chance to have a problem without knowing. And the current could cause the heart's rhythm to get irregular.
You want at the very least have the electricity flow away from the heart at the very least if you don't avoid the chest area completely
This is even more true while alone! at the very least have someone there that could call an ambulance and give help
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