That falls under the "experienced fluidity" bracket. In fact, that's exactly what "fluidity" is, whether it's experienced day-to-day or over the course of years. Asexuality, like hyper-sexuality, falls under the libido and general attractions, desires, comfort bracket.
Either way, "sexuality", motivations, preferences, fetish, the gender, sexual, affection, romantic, emotion, commitment spectrum is way more individual than behaviors or identities. But men like to whittle things down to sexual behaviors or what gets them hard, and that's often a mistake. While identity politics, male homophobia, ego, insecurities, sociology, traumas, mental health often keep men from really examining their make-up and their motivations. And the sex work world is all about fantasy, ego and money.