I've also never used a safe word. I'm evil and methodical, but at the same time I can tell when my lee is at her limit. I have never had a complaint, but that's not to say I will never use one. If a safe word makes the lee feel comfortable I'll be all for it. The goal is fun for both ler and lee.
I know we would all like to see you tickled and hear you laugh, but you should do what you want. You have been so kind and generous that we have no right to tell you what you should do. Thanks again. I know I would love to have you as my wife.