> this was the reasoning behind redefining "marriage" to include homosexual relationships,
No, limiting people's minds was the reasoning behind the *objections* to allowing gays to be "married".
> if I buy the means to that satisfaction; if a significant number of women I see and hear want to be my dirty little slut-whore, what kind of person does that indicate that I am?
I would say it indicates that you are someone who enjoys a bit of fantasy role-play in his sex life, along with a large number of other people in the population.
I would also presume that, like them, you also have a conscience and can tell the difference between fantasy and reality and know that enacting these things in real life with a non-consenting partner is not a good thing.
However to then call for such fantasies to be banned because of a spurious "slippery slope" argument or because "well there might be *someone* who can't tell the difference and could do something bad" relies on the sort of fallacious post hoc justificiations that lead to the Extreme Pornography laws and the desire to find a scapegoat to blame for something.
> As long as "no-one gets hurt" are we likely to progress from pretend-sex to trying it out in the real world?
Provided those partners are capable of giving *lawful* consent, what business is it of yours or anyone else?
> If you have an alcoholic or a heroin addict, do you put them in a padded room with alcohol and drugs and say, "off you go" or do you try to break the addiction and keep them away from places where they may be exposed to the temptation to indulge?
If people wish to indulge in drugs and alcohol, it's their choice.
If they want help, support mechanisms should be in place to enable them to get that help.
Prohibitions of alcohol and drugs have been shown to fail time and time again, but still our politicians and "moral media" won't grasp the nettle and admit that their "solutions" have failed and it's time to try a different approach.