The Minions creator has finally come forward and explained which sex the minions belong to: Turns out, they're all boys.
Why aren't there any female Minions? - Quora
Margo Gru, Despicable Me Wiki
Females Are More Innocent - TV Tropes
Minions creator: they're all male because they're 'dumb and stupid', Minions
Man Behind Minions Says They're Too Dumb And Stupid To Be Female
How Minions 2: The Rise of Gru explains capitalism - Vox
Minions: The Rise Of Gru' Review: Latest In Illumination Film Franchise
Like sexist 'Minions,' giants in 'The BFG' are all male
Of Mice and Minions: Why Are All the Cartoon Animals Male? - Pacific Standard
So Here's The Reason There Are No Female Minions
No female minions: Why are there no lady minions?