What is with the RCC’s obsession with sex. They treat it as if it’s dirty or something.
Priests can’t marry. Mary was always a virgin.
Sex in the context of a valid marriage is not at all dirty, it glorified God.
Mary remained a virgin in order to provide an incontrovertible evidence of the miraculous nature of the birth of Christ, and, quite simply, because her intimacy with God made sex superfluous. She did not abstain from sex on the false notion that it would have been a sin for her.