This nondescript building on Taylor Street down from The Big-T now houses a phone operation of some sort, but once upon a time, it was a porn store.
I don't suppose that such a place could have operated out in the open any time before the late 60s or 70s, at least not in Columbia, but eventually the "revolution" arrived even here. I recall riding down Taylor Street one day with my mother, reading the sign, and asking her exactly what was a "peep show". Strangely (to me then) she didn't really seem to have a ready explanation.
Since that time I believe that porn stores have been zoned out of downtown though there are certainly still some in the metro area. This building has had a lot of tenants in the years since then, and was in fact a law office at one time if I'm recalling correctly. It appears that currently, you can once more "reach out and touch someone" there.