John ( My Husband /Canada/ - Domestic Partner / USA/ ) and I have traveled X for years. We tend to meet many interesting people, and only a handful that we just wish we didn't.
X as well as MOST of its passengers are very respectful of our relationships, so don't worry too much about it.
As Fern also stated, there may not be anyone on your specific cruise to post to your thread. It might be helpful to go to the people threads and post under the gay/lesbian boards.
We have also attended FOD meetings onboard to meet new people.
Have fun on your cruise.