Ace/Aro (shorthand for asexual/aromantic) + flux (Latin fluxus, flowing, changing).
History
Coined within AVEN and aromantic communities online in the early 2010s for experiences of attraction that don't stay fixed within the ace/aro spectrum. Related to but distinct from abrosexual, which describes broader orientation shifts across the full spectrum.
Common myths
"Aceflux/aroflux people are just unsure whether they're asexual or aromantic." The fluctuation is the identity, not indecision about it. An aceflux person reliably moves along the ace spectrum over time.
"Experiencing attraction sometimes disqualifies you from the ace/aro community." The asexual and aromantic spectrums explicitly include fluctuating and conditional experiences of attraction.