How pastor's 'castrate' men in church

I will be the first to admit that I am not exactly 'big' on the whole church thing.
Yet I am aware that religion plays a large part in the making of our society, and churches are the vessels through which these things are expressed. And since seventy percent of any given church congregation are women, I assume the institution is serving them well.
But why is it that any given church congregation has a third or less of its whole being men?
'Men Only' has pondered this question – and I place the blame squarely on the shoulders of the male messenger. Yes, that man pastor at the pulpit is to blame.