Being a male ISTJ, I don't necessarily think we portray "masculinity" over "femininity," more so that we have a more neutral outlook towards everything. We analyze and use logic more often than emotion and spontaneity (not to say our feelings cannot be hurt.) Either way, I don't know any female ISTJ's in rl so I can't really form a solid opinion on such.
A specific example I have from my therapy is that I'm not emotionally dumb inside. No, I feel emotion, I just don't express it in my language (which I have been consciously working on, although difficult.) Be around an ENFP at any time, and you will hear the emotional language right away: they hate/love/are pissed off at/appreciate/are flattered by/etc. and so forth a lot.
My outlook on kids is the opposite of some of the above posters. I want them. Preferably a little girl, if I could choose. Might be because I was raised by independent females (mother and grandmother) and had a brother. It might be a personal preference. Either way, I attract children and animals like flies to s***, lol (which I hear is a good thing concerning character.)
One phrase I really enjoy is "calm, cool, and collected" (thanks, Deva.) It defines the general attitude/mindset that I portray 99% of the time. I am rarely ever facially expressive.
Another thing, about keeping in touch. I really never do, most of my friends call me. Occasionally I'll send the random text message to someone who I haven't spoken to in awhile, but if they don't contact me back, it doesn't hurt me at all. Mindless small talk is the bane of my existence, anyway.
Enjoyed posting about this.