He is shown engaging in autoerotic asphyxiation during masturbation. These include autoerotic asphyxiation and self-bondage. He acted out sexual fetishes for voyeurism, autoerotic asphyxiation and cross-dressing. However, reported evidence suggested that his death was accidental, the result of autoerotic asphyxiation. Blanchard has also published research studies on phallometry and several paraphilias, including autoerotic asphyxia. The sensational nature of autoerotic asphyxiation often makes it the subject of urban legends. Both of these lead to autoerotic asphyxia. Historically, the practice of autoerotic asphyxiation has been documented since the early 17th century. Chaos magic practitioner Peter J. Carroll distinguishes such "autoerotic" rites with visualization from eroto-comatose lucidity. The strips also dealt with bisexuality, autoerotic ecstasy, super-sensual abandon, and sadomasochism. Hazelwood also gave lectures across North America about sexual sadism and autoerotic fatalities. Genital play is a common early childhood behavior of genital exploration distinct from autoerotic stimulation. The most common autoerotic practice is masturbation. A performance can include actual or simulated autoerotic acts or sexual activity with another performer. The subject has been treated in two books, "Autoerotic Fatalities" by Hazelwood et al.