If you want to equate becoming pregnant by the Holy Spirit with sexual promiscuity, the it's not the Protestants who are more comfortable with the idea that Mary was a slut.
She was betrothed to Joseph. HE was her husband. By claiming that the Holy Spirit was her husband, that makes Mary an adulterous by having two husbands.
If the Holy Spirit was her husband as Catholic like to claim, then her marriage to Joseph made her an adulteress.
Problem is, she was betrothed to Joseph at the time the angel visited her.
You have your Mariology and Ecclesiology confused. It is the Church, not Mary that is the bride.
I always heard it was Italian men could only think of women as sluts or Madonnas. Is there no in-between with some guys??? ;o)