Many mistakenly believe that  the because of the vow of celibacy that Priests and Nuns don't partake in the sacrament of sex or masterbate. The vow is only with regards to not marrying, not the fornication which is natural. This came about at the end of the first thousand years of Christianity as the Church found itself not gaining lands and property. A genuine Catholic BJ

In those days, when the Roman Catholic Clergy married, the children of the Clergy inherited the property of their parents.  Once the Church no longer recognized a marriage within the clergy the property of that Bishop, Priest or Nun now became property of the Church. In this way over the last one thousand years the Catholic Church has become the worlds largest property owner and richest institution.