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Much depends on if they keep their vow of celibacy. However, I do question what role they can play in the Church. Can a homosexual priest rightly advise a heterosexual man or woman during a marital crisis? At one time I might have said "yes", but since the recent events regarding the sexual abuse scandals, I have my doubts.
"However, I do question what role they can play in the Church. Can a homosexual priest rightly advise a heterosexual man or woman during a marital crisis? "
No...I don't think they can.
I think their disposition makes it impossible for them to understand the male/female spiritual/emotional/sexual bond.