I'd be very surprised if most guys played as female character, i would think most would be like me and on the first playthrough at least, play the PC as more or less yourself with minimal actual roleplaying, saving that for future replays.
I normally always play as a male character on my first playthrough (as i'm a guy) because it's the easiest for me to role play. But in subsequent playthroughts i experiment with different races, personalities, classes and genders.
When it comes to Cannon playthroughs i go with the one i A) Have fallen most in love with as a character
Makes the most compelling story.
So for origins i go Male City Elf warrior because i enjoy the idea of being the oppressed Hero who is looked down upon by the people he's trying to save. (gender for this just comes down to a personal choice for me because my Warden is pretty much a direct copy paste of my personality in all its good and bad aspects), and i find warrior the most fun.
DA2 i go sarcastic male warrior or Rouge because i think being a mage makes no sense given that all of Kirkwall would know you're a mage after act 2 but no one does sh*t about it, and it makes you too invested in the conflict, and i prefer to play my Hawke as someone desperate to stay neutral, but eventually forced to go against with Meredith after she goes insane and wants to kill all mages because some might be blood mages. As for gender i just prefer how the male VA delivers the sarcasm lines which are totally the best hawke lines 
For DA:I i initially played as a male Qunari Warrior (seeing a pattern here), but after the ending reveal of Solas i decided it was best for the story to go Female Elven Mage and romance Solas for the feels. I was very hesitant about it at first but i was shocked at how invested i got in the romance and my character. That character investment was lost on me when i played as my male Qunari.
So yeah, i can't speak for all men, but personally i just go with what makes sense for the story and what's easiest for me to empathize with (generally that's a male perspective on things)