I don't know the answer to your question, but would assume "yes", as every Celebrity ship (owned by RCCL) we have been on was gay-friendly with many gay employees.
We were booked on the Jewel of the Seas TA last year, but ended up cancelling and re-booking elsewhere. However, there were several gay cruisers on the roll call board.
Unless you do something that is overtly obnoxious you should have no problems. The bulletin board lists FOD get togethers, the steam room is friendly if cautious, and you can have a great time.
We just came off of Freedom of the Seas and had absolutely no issues. We had met about 4 other couples too.
We booked Jewel of the Seas in December for a b2b cruise.