Your post got my attention on a couple of fronts; the main one that you mention that your wife is hyper-sexual.
My wife has an unusual form of bipolar disorder, with hyper-sexuality. It was something that neither of us understood well, and has been an underlying factor in her infidelity.
KK has a set of associated personality characteristics that are intertwined with her disorder; attention seeking behaviors, novelty / variety seeking behaviors, risk taking, manic, hyper-focused behavior, and a fairly short attention span.
Certain medications, like sertraline (aka Zoloft) impact KK’s hyper-sexual tendency, exacerbating it, which perversely is something we use to our advantage.
Cheating/infidelity are often side-effects, symptoms of hyper-sexuality. It takes adjustment, acceptance for the other partner, as the disorder is difficult, sometimes impossible to control.
If you find it erotic, stimulating, accept and support her, encourage her to explore and experience her desires.