Straight people have no idea how much of their sexuality they convey in every day living and what they talk about, that LGBT people just do not have the freedom to do. I can see the appeal of having a dive club around shared interests, whether they are diving or other characteristics.
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Basically most posters here are completely missing the point about why someone would be interested in organising a LGBT club/dive event.
I have to say, I do feel I have learned something reading through this thread. I had really never thought about some of these issues before.