1970-1975, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure J & I had beautiful sex. He stayed last nite & we were all over each other almost the entire time. […] He's wearing these these wonderful bikini underpants that are so full. He's really gotten to be an anal-erotic too which I just love.
Source: wiktionary