I've written short stories from male perspectives before, and I've never had a problem with it as long as I've understood the character's emotions and motivations.
I've read a lot of fiction from writers just starting out, and the dialogue is a little bit forced, or it's almost too teenager-y, or too slang-y or putting too much technology or trends in there. I try to stay pretty trend-neutral. I try not to mention too many current bands or current TV shows.
I am a big outliner. For my adult book, 'The Visibles,' I did not outline, and it took me two years to write because I just didn't outline, and I had no path.