Don't know if you know this, but Mother Theresa's Missionaries of Charity shut down their adoption services to avoid accepting applications from single or divorced parents. Mothers and fathers were cited as "natural"; single parents as morally suspect people who might not be able to provide "real love." At least some of this appeared to be based on Catholic teaching about marriage. 

Just wondering why the priest gets a pass. Do you know what kind of background check they do on you if you adopt? It sucks up a year of your life. Hope the priest goes through the same process.