See post 152.
-A8
"Perpetual virginity" is very different from "intact, physical" virginity after natural childbirth which strikes many Christians as ludicrous.
I think a distinction is being made between virginity as absence of sexual relations with men -- let us call it social virginity -- and physically intact hymen, let us call is physiological virginity, which hypothetically speaking would have been lost in childbirth, were the childbirth to proceed without a miraculous involvement of God.
It is true that the distinction never occurred as important to the Early Church, but we live in a faithless age. Stars popping up in the sky at Christ's birth we believe, magi traveling through the desert dodging Herod we also believe, virginal conception we believe, resurrection from the dead we believe, walking on water we believe, but to believe that God could go through a piece of skin just strains imagination too much.