Betts also reviews other data that shows that the ovulation method places the onus on women to regulate sexual activity, and therefore ignoring the social context in which sexual activity takes place. For example, studies showed that women were unable to negotiate abstinence from their husbands during specific times. Betts' research calls attention to the way in which the ovulation method became institutionalised in hospitals and birth clinics that received funding from Catholic-affiliated institutions. For example, in 1973-1974, Betts notes that the Family Planning Association received $200,000 of Government funding while Catholic family planning agencies received $100,000. In the late 1970s, Betts notes that half of pregnancies were still unplanned. Under these circumstances, Betts argued that Governments should promote methods of contraception that were more reliable. Betts returned to this subject in the mid-1980s. She notes that the Billings Method had come under significant criticism, including being the subject of an inquiry by the Royal Commission on Human Relationships. Betts' research reviews evidence from comprehensive studies on the biological basis of the Billings Method. The evidence shows that even amongst women who monitored both their body temperature and vaginal mucus levels, mucus symptoms were "erratic." In one study of 166 women who recorded 1,600 menstrual cycles, 75% of participants could observe mucus in every cycle, while 21% could only notice this sometimes, and the rest couldn't measure mucus at all. Other studies showed that women were more likely to get pregnant using the Billings method than women using other methods, such as the oral contraceptive pill, IUDs, condoms and diaphragms. Most of these women said they either abandoned the Billings method or miscalculated because the method was either "too complicated," or there were "too many rules to follow" or there were "too many qualifications" to observe. Betts argues that while all methods of contraception require that individuals adhere to proper use, the Billings method was still less effective than other methods and she questioned the Government's continued support of this as a primary family planning strategy. While Betts continued to research population issues over the next two decades, she returned to specific topic of women's fertility issues and population in the mid-to-late 2000s. During the October 2004 Federal election, Christian lobby groups and Coalition candidates ran a campaign advocating that the Australian population was largely against abortion. Betts drew on empirical data from population surveys which showed that 81% of the Australian population was resolutely pro-choice, while only 9% were firmly against abortion.