 This aspect of Gill's life was little known beyond his family and friends until the publication of the 1989 biography by Fiona MacCarthy.An earlier biography by Robert Speaight, published in 1966, mentioned none of it.Gill's daughter Petra, who was alive at the time of the MacCarthy biography, denied the allegations but described her father as having "endless curiosity about sex" and that "we just took it for granted".