I know a few male INFJs as well as female ones. I spend allot of time observing and interacting with them, I tend to get along with them fairly well.
Males are difficult... they think they're superheroes. I've never met or stalked an INFJ man who didn't have this "misunderstood saint" attitude about himself. Sometimes it's not very apparent until you really start discussing things (especially typology) with them. They can be overly mushy, and self-centered with interactions, and disloyal until you establish a stronger friendship with them. They tend to want desperately to be understood, and emotionally stroked (and physically for that matter :laughing

. They seem to focus extremely intently on justice and "good and evil".
They often get friend zoned... the way they behave isn't always very attractive, but they make awesome and supportive friends. They're very romantic and will pile affection and roses on you, and jewels and trips to beautiful places if they have the money. They're extremely adoring people, and very unique and interesting people. Some are almost out of a comic book with how strange they can be, and some try to blend in socially much more. They have a hard time not seeing themselves as completely alone in the world, aliens almost- they're so often scared of how shallow everyone seems to be, and want to be accepted and loved by everyone.
They think allot- sometimes so much that they think that they are 'thinkers'. They're fairly intelligent (not usually as much so as they think they are though, :laughing

and great to have a conversation with if you commit enough to become good friends with them. They take allot of patience and commitment, but they'll usually return it for you.
They're very cool people! I'm very fond of them.
These are all things that I've noticed are consistent between all the INFJ men that I've interacted with or observed that makes them notably different from most female INFJs that I've interacted with or observed. Just thought I'd share what I've noticed.

roud: