Some people think that Ennis, and perhaps Jack, were omnisexual (definition=pansexual, go figure).
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I found this definition for pansexual
Pansexual, omnisexual, and pomosexual (postmodern sexuality) are substitute terms that rather than referring to both or "bi" gender attraction, refer to all or "omni" gender attraction, and are used mainly by those who wish to express acceptance of all gender possibilities including transgender and intersex people, not just two. Pansexuality sometimes includes an attraction for less mainstream sexual activities, such as BDSM. Some people who might otherwise identify as pansexual or omnisexual choose to self-identify as bisexual because the term bisexual is more widely known, and because they see it as an important term in identity politics.
Sandy