do catholics really believe that men and women have seperate and distinct functions? or is that a cultural belief?
They don't let women in the priesthood, do they.
There are certain verses in the Bible. The hammer verses we used to call them.
1 Tim 2:12
I do not permit a woman to teach or to assume authority over a man; she must be quiet.
There's also Ephesians 5:22-23 which directs women to be in submission to their husbands
From this, conservative Christians like the Catholic church in England argue that it isn't a woman's place to be in leadership over man, at all at any time but especially not in a church setting. Back before feminism kicked off the church would argue that women were just a lesser type of human, inferior in role and inferior in essence. The feminist revolution changed all, it became very uncool to talk about female inferiority so instead this theology of gender evolved which stated that men and women are of equal value and worth, but the good lord has seen fit to task men and women with different roles and functions in society and different natures to go with our respective roles. God has given man the nature to lead and women the nature to submit and follow.
They use the term complementary, the article even refers to complementary. You might have read that as just a reference to human sexual dimorphism but in a Christian setting it means so much more than that, it refers to the natures of men and women and what they believe to be our respective roles in society.