My partner and I have sailed Cunard 8 times and will have our 9th. cruise with them this summer. Our first two cruises in 01 and 02 on QE2 and Caronia were with gay groups and nobody on board batted an eyelid. Other gay couples travelling on their own were also evident.
Since then, we have booked independently and have always asked for the beds to be made up as one - again no comment - and the daily programmes have always advertised FOD meetings. Indeed, there was a FOD meeting advertised on QE2 on her second last night in service.
As a gay couple, we have always found Cunard a comfortable line to travel with, and our table companions have always been friendly and welcoming, in all the restaurants we have eaten it - Mauretania, Caronia and, most recently, Queens Grill. I wouldn't hesitate to recommend Cunard to gay travellers.