We have sailed on Celebrity many times in the past few years and have never been disapointed. Celebrity is a great cruise line. The Infinity looks like a beauitful ship and I am sure you will enjoy it. We have always met other gay couples on our Celebrity cruises. If you happen to have Fernando as your wine sommelier you will be very entertained. (he moved from the Mercury to the Infinity) If you have a butler, you will be very spoiled.
You will not be disapointed with Celebrity. Be sure to join the Captain's Club. It is worth it for future cruises with them.
Have fun and don't forget your hats and sun screen! lol