Ectosexual

Ectosexual is an umbrella term for the attraction to people other than oneself. It is the opposite of autosexual.

History
Ectosexual was coined by unknown at unknown time. The first recorded appearance was on January 27th, 2018 at Tumblr blog Beyond MOGAI Pride Flags.

Flag
The flag was coined by Deviantart user FlagsforCisHets on July 20th, 2018. It is the autosexual flag inverted.