They followed the Lamb wherever He goes

"These are they who were not defiled with women; they are virgins and these are the ones who follow the Lamb wherever he goes. They have been ransomed as the firstfruits of the human race for God and the Lamb."  (Revelation 14: 4)

God loves purity and chastity.  Virginity in the above scripture may be a symbol for corporal or spiritual virginity and purity.  Apostasy and adulteration of doctrine is considered spiritual adultery.  The pure and wholesome milk of  Christ's teaching is fully contained in the deposit of faith which is guarded by the Church's Magisterium.  From the first beginning of the age of the Church.  this body of truth has been under attack by heretics and apostates.  But thanks to the promise of Jesus Christ and the work of the Holy Spirit, the Church has remained the bulwark of truth to the present day.