The Difference Between Threesomes, Orgies, and Trains — And Other Things You May Not Want to Ask

So what IS the difference between these terms? Read an excerpt of the Bravo TV piece by Marni Eth featuring NSFW PRo SEX initiative below, then the full article here:

“Daniel Saynt, founder of NSFW, recently launched the PRo SEX Initiative which is focused on creating a safe, judgement-free community for sexual exploration. The organization is also working to change the law to prevent discrimination at work and housing for those who enjoy "not vanilla" sex lives. Saynt explains that “someone else's sex life shouldn't be the point of your conversations” and “if you're going to discuss sex, know what you're talking about.” He also explains a few other terms that have been discussed on air.”