A true professional!
As I mentioned, my S&M experience has been pretty limited so it's tough to know exactly where I'd draw the line in terms of pain. In general though, I think I'd consider myself more into the sensual side of things than the really painful side of things if that makes sense. Heavy whipping/caning, cbt, really harsh nipple play, etc. would be above my threshold but most less intense forms of torture would definitely be welcomed. I'd also be willing to test my limits a little bit, even if only to get a better understanding of where they are. However crossdressing/sissification, bodily fluids, foot worship have never really been turn ons for me.
Tickling, tease & denial, facesitting, etc. are more my speed, along with just the general feeling of being overpowered, captured, stripped, left vulnerable and unable to escape. Bondage, devices, cages, and the mental aspect of being "forced" to endure things has always been much more of a turn on for me than the classic sub on his knees in front of the beautiful mistress.
Hopefully I provided some info that you were looking for! I have always felt like my interests are somewhat unique- and I'm cool with that.
Oh, no Linux reference, just a childhood nickname that stuck