MOTAS = M = MOTSS

MOTOS /moh-tohs/ n.

[acronym from the 1970 U.S. census forms via Usenet: Member Of The Opposite Sex] A potential or (less often) actual sex partner. See MOTAS, MOTSS, SO. Less common than MOTSS or MOTAS, which has largely displaced it.

MOTAS = M = MOTSS