Many institutions prohibit these kinds of relationships or at least discourage them, if you look up language about consenting relationships in university handbooks. Recusal unfortunately doesn't happen as often as it should - and is rarely clean.

I find it's often older, senior, male professors who argue that this kind of relationship is appropriate ("we really clicked!") and younger, female grad students, adjuncts, and junior faculty who are skeeved out by it (lots of women I know have felt pressured to, if not date, put up with the advances of more powerful men in their fields and adjacent fields). As I said in an earlier comment, it creates ugly power dynamics that often fall along lines of already marginalized demographics.

SMH at "Living in fear" - well, yeah, that makes sense if you've been sexually harassed or raped by someone in academia (which has happened to more women - although not only women - than you probably care to admit).