This is EDITORIAL, NOT MY BELIEFS
Look at the history when porn grew in popularity. At least in the US, it was the late 60s or early 70s. Races were just starting to mix in the US. Until 1967, interracial marriage was illegal in some states. Fucking a black man, who many at the time, and some how think is "inferior" was taboo.... back from the disgusting slave days in the US, the guy was a "dumb n---" but look at his penis! The woman (and this was sexist and degraded women too) had a husband or BF who was white, but just couldn't give her what she really wanted. Only the black man could. It's also pretty dumb to think that a woman would give up a BF, husband, marriage and all of that for a big cock... but that is the taboo that many find hot.
The name of the website itself is a bit racist....BLACKED. All of that said, some of the videos are pretty hot. Just two people having sex, the way vixen videos are hot.
It was and still is taboo with many people, much like the "incest" videos that are popular today.