What defines leading someone on? Or being a flirt? And do INFJs do that?
Not that I'm aware that I am naturally friendly or a walking warmth-emitting aura, but in my opinion leading someone on, or being a flirt, has to do with your underlying motivation (motives). This calls for (lol) internal reflection.
Just because you are normally naturally friendly, bubbly, earnest, etc., should not "lower" you automatically down to the level of a flirt. Some people are just who they are, and if there is a problem, it is the other half's.
It does seem the same-sex ratio for lasting friendship is higher than the opposite-sex ratio. This is because of reasons including all of the previous posts described; (one or both halves start thinking about possibilities, things happen and can't go back as it was platonically before so forth/complications); but I chose not to
believe this applies to everybody, and there is an exception to every rule.
Certainly, I have one example of a platonic male friend - though held at an arm's distance, still completely and utterly, platonic for a while now.
Now that there seems you have gathered some sort of "awareness" to the affect of your personality to men, you're cautious of this, and I think this will show in your interactions anyway. The change is inevitable. What hasn't is your motive, the pursuit of being "just friends" honestly, with men. I do think stating this line very clearly early will help, may need continual reminders, to which may be the end OR not the end of a friendship... but the important thing is, just continue being you and if you honestly had a look at yourself, and did not truly intend to "lead someone on", that is the only thing that matters here.
Motives... that is one fine line that means a heck of a lot to me. /rant from one infj