I believe that all equipment should be sterilised to hospital standards as dirty equipment literally puts people's lives in your hands. This is something that I take very seriously as there are a great many diseases that can be transferred should incorrect sterilising procedures be used. For metal instruments a medical autoclave is the perfect way to sterilise instruments, but when using non-medical attachments like those that accompany electro-stim, cold sterilising is the only way to clean to above hospital standards. There is no such thing as a 100% guarantee, not even a hospital could offer you that, but 99.9% is close enough. I also wear disposable latex gloves throughout each session and the room is thoroughly cleaned between appointments. I advocate the use of safe words in sessions for newbie subs to give an extra safehold that you can stop the session at any time should you wish. This is not a reflection on the subs ability to play and not a criticism of the mistress if a safe word is used. BDSM play is a two way experience and for this reason the scene needs to be right for both parties to enjoy the session. I am an excellent reader of body language to know what's working and what's not. Most of my regular slaves play without a safeword but that is trust that can take time to build. Either way, you can rest assured you will be walking out with a spring in your step and a smile on your face.....(or am I describing me after a session???)