A: I thought she was bi and had lost it to a girl? She's been dating like everyone B: Nah, she's a pan-romantic heterosexual so she'd date anyone but only sleep with dudes
when someone is romantically attracted to both female and males but is also sexually attracted to the opposite gender
Guy 1: Hey, look! it's that girl you were talking about!
Girl 2: Yea but I'm only attracted to her romantically. I'm biromantic to both guys and gals but also heterosexual to guys. I'm biromantic heterosexual
When somebody experiences "attraction" to the opposite gender because that expectation has been pushed on them by the patriarchal society, this is quite often experienced by lesbians. It is quite difficult to distinguish between your own feelings and those which you are expected to feel.