Well, we have straight rooms in chat, where man want to talk to women and women want to talk to men... so, why don't you make these rooms automatically 50% men and 50% women??
Another thing would be to eliminate "lobby" and get users in rooms according to their sexual orientation automatically. This doesn't have 2 be definitive: users could change room, but they'd be automatically placed in a room that (theorically) suits them best.
Example: I'm a straight male, so when I login to chat I'd be automatically placed in a straight room with 50% boys and 50% girls.
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