There was IR sex back in the day, they were just discreet about it. About 10 years ago, we were in Atlanta for the weekend and my wife met and fucked a black guy in his early 70's. Afterward, we were hanging out, and I asked him how long he had been in the lifestyle. He said he had been fucking white women since he was a teenager in the early 60's, and that he got way more white pussy in 1960's South Carolina than in the 2000's or 2010's because the taboo aspect of it made white women practically attack him if he showed them any signal of interest at all. He told us that none of them would ever say a word afterward given the era, so he was not that worried about getting caught.