The Billings Ovulation Method (BOM) is a method which women use to monitor their fertility, by identifying when they are fertile and when they are infertile during each ovarian/menstrual cycle. Users pay attention to the sensation at their vulva, and the appearance of any vaginal discharge. The Billings Ovulation Method does not rely on the presence of ovulation, rather it identifies patterns of potential fertility and obvious infertility within the cycle, whatever its length. This information can be used to achieve or avoid pregnancy during regular or irregular cycles throughout all stages of reproductive life, including breastfeeding, and peri-menopause. Described by the World Organisation of the Ovulation Method Billings (WOOMB) as "Natural Fertility Regulation", this method may be used as a form of fertility awareness or natural family planning, as well as a way to monitor gynecological health.
In trials, method related pregnancy rates have ranged between 0% to 2.9%. In a major trial in China 992 couples using the Billings Ovulation Method were compared to 662 couples using the IUD. The method-related pregnancy rate amongst Billings users was zero and the total pregnancy rate was 0.5%. In studies up to the 1980s teaching related pregnancies ranged between 0% to 6%. Total pregnancy rates vary between 1 and 25%. Reasons for a higher total pregnancy rate include misunderstanding the method, risk taking, ambivalence toward pregnancy, and deciding to become pregnant.
Zoon, Nefilim's only studio album, was released in April 1996 by Beggars Banquet Records (Calatogue number BEGA172). The album saw a move away from the rich soundscapes that characterised earlier works from Fields of the Nephilim towards a darker, more industrial/death metal sound. McCoy has stated that the album was in development hell for several years due to restrictions from the record label. The album is dedicated to Scarlett McCoy, Carl McCoy's daughter.
A music video was created for "Penetration", and the song was later covered by Polish band Behemoth on their EP Slaves Shall Serve.
The album is a concept album, and while McCoy remained largely silent about the themes, one possible explanation is that the story revolves around the Watchers and the Book of Enoch. The word "zoon" is derived from Greek, meaning "living creature" or "beast".