Hi, I'm Dan Jacobson, website manager for http://en.wikipedia.org/wiki/Taiwan_TG_Butterfly_Garden TG stands for Transgender, so that brings in "just how do you define gender? by ID card? by DNA?" etc.
But never mind that. Indeed, in the nerd-most caverns of computer science I too notice the developers are almost all currently (or formerly!) males.
I accept the fact and expect that in 100 years, brain anatomy science will tell us why that is.