Fertility calculator in natural family planning methods, if a woman monitor their temperature daily and records the strength of their cervical mucous to determine when it is most fertile. Discover the uses of a fertility calculator with advice from a human sexuality consultant in this free video on sexual health. Expert: Carol L. Clark Contact: www. drcarolclark. com Bio: Dr. Carol L. Clark has a Ph.D. in human sexuality, and she works with a variety of individuals, couples and groups with a variety of concerns. Filmmaker: Paul Müller