Long Term Relationship
LTR in personal ads means long term relationship.
In Search Of
professional
In the personal ads that I have seen, LOS means Lost or Stolen.
This abbreviation most likely stands for "Party and Play" when used in a personal ads,though it can mean "Plug and Play" when used to talk about technology. The abbreviation PNP when used in personal ads usually refers to the use of Crystal Meth.
Friends With Benefits
transsexual for male
height weight proportionate
Try web cam
married black woman i think
married man or married male
"short Message service" in other words text. It's not exclusive to personal ads.
It might be part of the address of the involved parties, or an abbreviation for polygamy.