In personal ads, 'ltf' typically stands for 'looking to f**k.' It is a discreet way of indicating that the person is seeking a casual sexual encounter or hookup.
Looking to find, I believe
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
In Search Of
friends with benefits.
Pay to play
"short Message service" in other words text. It's not exclusive to personal ads.