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There is no consensus among scientists about the exact reasons that an individual develops a heterosexual, bisexual, or homosexual orientation. Although much research has examined the possible genetic, hormonal, developmental, social, and cultural influences on sexual orientation, no findings have emerged that permit scientists to conclude that sexual orientation is determined by any particular factor or factors. Many think that nature and nurture both play complex roles; most people experience little or no sense of choice about their sexual orientation. 
Good question, although - as an quantitative expert - I am not sure about the answer. In principle I think all the headings can be used in a qualitative proposal as well, although qualitative studies more often use a theoretical/conceptual framework, so that should be more prominent. Annette
When an electronic source lacks page numbers, you should try to include information that will help readers find the passage being cited. When an electronic document has numbered paragraphs, use the ¶ symbol, or the abbreviation "para." followed by the paragraph number (Hall, 2001, ¶ 5) or (Hall, 2001, para. 5). If the paragraphs are not numbered and the document includes headings, provide the appropriate heading and specify the paragraph under that heading. Note that in some electronic sources, like Web pages, people can use the Find function in their browser to locate any passages you cite. According to Smith (1997), ... (Mind over Matter section, para. 6). Note: Never use the page numbers of Web pages you print out; different computers print Web pages with different pagination.
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