I've considered this but rejected it. At least for here. There isn't a poster here who hasn't divulged into speculation into someone's personal affairs in some guise. Yet it's routinely only homosexuality that gets the 'It shouldn't be mentioned' replies.
I see that more as people trying not to sound at all homophobic personally. They are saying 'it shouldn't matter' basically. Maybe they go overboard compared to other activities- but some people are very easily offended when it comes to their sexuality, so people just consider it most polite to say it's a private issue.