I've never played as a female in a Fallout game. I prefer to play as a character of the same gender as myself because it just feels more immersive to do so.
BritishBoyStar pretty much gave the perf answer a couple of posts above

I'll play as both. The whole gender thing doesn't matter to me, both genders basically get the same skill and stuff.

i generally play as male cause im a male and i find playing as a male but alot of the times i do end up doing a second playthrough as a female when i have time or interest to do it.

I'm always playing as a male. I just cant immerse myself in the game if I'm playing as a female.

Sometimes a play as male because i have many good races mods in my fallout an they are male race but i recently i'm playing as female because the Jill Valentine mod by Isquall

Male, but you'd never be able to tell from their outward appearance.

I usually make males but I do often make female characters too.

I always make males.

Males usually. Unless there are good unique female options, in which case I'll go girl

Female, because i would rather look at a female back side than a male one. I will say that some of people who say they mostly use males, use females more than they would admit.

Always males characters

Well I usually play a male in almost any game that allows me to. I'm a male in RL and usually most of the characters I create contain characteristics of strong male protagonists in other game franchises that I admire. I see things from a male's perspective during playthroughs and when I try to play female, I can just never get comfortable with her.

Now I will admit that every release I do at least one playthrough as a female to try to experience everything playing the gender will unlock. It's also nice to just have a beautiful woman gracing my screens rather then gruzzled drug addicted menaces my normal characters are!

I usually play as male and try to make him look as badass as possible.

Pretty much always male. But the idea of playing as an older Ellie has crossed my mind. Maybe next game.

I always use male, however some outfits and races (e.g daughters or Ares) will make me try female

Usually male

Always male gender. I usually just role-play myself and last time I checked I was a male..

I've only ever played as male characters. Think alot of the guys on youtube play as women to display clothes and armours.

male this isnt the elder scrolls

I've played as a males 99% of the time, but I had a female character once to see how differently you would react to certain situations. Without being vulgar, I'm referencing primarily the idea of being captured by legion or raiders, it would tend to worry me alot more as a female character than a male.

I found it didn't effect the roleplay aspect of Fallout in any enhanced way, so I went back to my default creation method of using my own face, or someone from Dragbody's packs.