I was in their Pforum2 which had huge archives that I loved, and they taught me a lot! I was in a DADT open marriage and my husband wanted our open M discreet. It used to be a very active forum when it was Pforum2 this is their 4th forum. I was in there about a decade ago. There were some in a SM and there were others who were creating a SM.
MM= Married Man BS= betrayed spouse AP= affair partner OP= other partner, not original poster as one would think two groups merged and some of them used AP and the other group used OP
I followed a lady that had an AP named after a major motel/hotel chain. That might have ended 2 years ago. I think the guy was called Hilton. He had work in the lady's area but the project ended and the relationship dies out. the woman said she was dedicated to her H but needed the time with Hilton.
A few other posters just wanted the New relationship energy NRE so they frequently had new partners.
One guy posted about 2 or 3 women frequently wanting a quack with him and some of this happened around some ski area. This guy sounded like he was over worked sexually. Some problem considering some of the people on ILIASM haven't had good sex for years.