.. and why
Just as a BS Thought experiment

Mine:
First Thought was i would choose 1 man for 2 women, so 33% male, 66% female.

I guess then the summed up Thirst of men and women for Sex would be kinda equal, i think it would be a good match.
Being male would still be 'normal', but i guess you would be more welcome everywhere as a male (eg in clubs, in university groups where you write a paper together, anywhere).
I wouldn't want to be 1 man for 100 women, then i guess it would be a weird status in a woman's world.
With 33% male i guess world still would be kinda normal. GDP economy sure would take a cracy hit because of missing higher earning males and males not being as motivated to 'get rich or die trying' for getting sex.