As far as the idea of relating coming out as “kinky” to coming out as being gay, I think there are certainly similarities, but there are telling differences as well.
note: The following is purely subjective interpretations of interactions I’ve had with people of various stripes and attitudes and may well be skewed by my perceptions or the people with whom I associate
In the first place, I don’t think that people who are outed as being involved in BDSM face nearly the same physical danger that gays do. I have yet to run into someone who says they were bashed because they were known to be involved in BDSM. Additionally, unlike being gay, unless someone is gong to be extremely eccentric on their trips to the supermarket or out to dinner, there’s no obvious way to know who’s kinky and who isn’t. Unlike a gay couple, a man and a woman holding hands as they walk through the park might be a wonderfully romantic and purely vanilla experience for them. On the other hand, they could also be a dominant and submissive walking along, one subtley but convincingly controlling the other with a simple grip on their hand. At the same time, I do feel that there can be a more widespread, if more subtle, social sanction against them if it does becomes common knowledge.
I think casual interest in BDSM is a very widespread. As such, most people can at least imagine or fantasize about an encounter with their partner that incorprates BDSM themes, be it a little bondage or spanking or whatever. Accordingly, I think that these people are much less threatened by and more accepting of someone enjoying BDSM than they might be by someone who is gay.
This acceptance holds for people who engage in BDSM “from time to time” or as part of their sexual expression, but I think it tends to run into a brick wall when confronted with those who take it more seriously and incorporate it into their daily lives. Those people who are accepting, to one degree or another, of casual BDSM activity often do not have the same tolerance for those who are engaged in a “lifestyle” or 24/7 BDSM relationship. During one of the few in-depth conversations I’ve had on the subject with someone who incorporated BDSM into his daily life, the dom actually used the same analogy. He felt it was funny that in his area (Boston) he felt that gays had a greater level of acceptance than he did in a hetero BDSM relationship.
I think I’ve seen evidence of the same predjudice borne out in other conversations with people who are accepting of “a little spanking now and then”, but throw up their hands in horror at the idea of someone actually living that way. To be sure, there are those who are not involved in BDSM, or involved only casually, who shrug and say “Whatever works for them”, but I’ve not found it to be a terribly common reaction.
[sup]could I work the word BDSM in there a few more times if I really tried?[/sup]