No Red Indians I'm guessing. Sure sign the ad belongs to a small minded bigot.
In the personal ads that I have seen, LOS means Lost or Stolen.
Androgynous
For sex :)
Long Term RelationshipLTR in personal ads means long term relationship.
professional
water sports
Bareback, or no condom
OHAC mean in Relationship
friends with benefits.
In Search Of
Pay to play
"short Message service" in other words text. It's not exclusive to personal ads.