The sexual equivalent is acevague.
The term was possibly coined by deactivated Tumblr user dogora on or before November 30, 2014.
The arovague flag was designed by DeviantArt user transboy-lou on or before December 16, 2016. The design was inspired by the gendervague flag. The big gray space is supposed to represent the “vagueness.” One can place the flag of a different orientation in the gray space for combination identities.