I would consider "topping" for a relative stranger, taking the reins for that encounter, but truly being Dom to someone I don't know well is simply not an option for me personally. I prefer to know someone well enough to know their buttons, and which ones to push for the desired effect. It just isn't as fun for me to "play" with a guy I have to guess about, regardless of whether they've elected to submit or bottom. I have done it, back when I did many other irresponsible things, no condemnation either way. It just isn't an activity that presently appeals. Someone else's submission puts a great deal of responsibility in my hands, and I'd rather only be responsible for those close to me.