Could you explain this a bit more? I'm not really in the BDSM lifestyle so I'm curious.
Basically, in BDSM there is a whole bunch of stuff. S and M is where there is a sexual/sensual power dynamic. The Dom is in charge and the sub is very submissive. But more than that is S and M where hitting, candle wax, whips, and even chains can get involved Bondage means this all happens while the sub is tied up.
Safe words are so you have a key word to make them stop. Because yelling stop can sometimes be part of the fun so you need something to get the idea across. Oftentimes the idea of not needing it is praised in the community as well as pushing boundries. It is a bit of a problem in the community that people should and do get very annoyed if you use your safeword at all often, and while Bull is the ideal of any BDSM relationship, in real life this gets messy. People threaten to leave if you say you are uncomfortable in a certain area and always use your safe word about it, or it is considered too "vanilla".
The idea is to push your boundries and explore emotional and new physical sensations but there is often a problem about pushing limits past peoples comfort zones and not respecting them.