I've had male friends since I was a small child also. My best guy friend and I have been friends since birth practically. We played together as babies & were penpals when he moved away. I suppose this is why I am familiar with the brother-sister dynamic concept despite not being close to my half-brother.
I have a pseudo-brother too! I've known him since I was thirteen. He called me from the hospital when his daughter was born.
"Sentiment without action is the ruin of the soul." - Edward Abbey
I think it's healthy to recognize as we live that this planet is shared with others like us, there may not be a direct connection between us, but the fact that a forum comprized of people from different geographical locations can relate so well is evidence of this and xNFP's are great at understanding this.
I think XNFPs can be really bad at gauging boundaries and appropriate signals. There are several threads already on the forum specifically about XNFPs attracting the wrong kind of attention, etc. INFPs moreso than ENFPs, I think partially because introversion makes you more receptive/likely target to and of peoples energies and advances.
While I think this is true sometimes, I also think that NFPs can be very aware of non-tangible clues, like "emotional vibes" & that sort of thing. I can usually sense when a guy finds me attractive - I just tend to become too humble/insecure to ever initiate even when I get clear vibes. In a friend situation, I'd take care to make it clear I don't have any romantic interest if I got that feeling (and yes, I have done that before).
For me, the thing with the weirdos latching on has more to do with misplaced pity/compassion than not being aware of their intentions.
I am also not one to flirt without some genuine interest & tend to send aloof/disinterested signals to men, even unintentionally when I do find them attractive.
"Charlotte sometimes dreams a wall around herself. But it's always with love - So much love it looks like everything else. Charlotte Sometimes - So far away, glass sealed and pretty." - The Cure