Evulz attempts Tickle Torture, and Bob tells him he should get more feathers.
Evulz punches him in the face repeatedly to torture him and Bob asks him to do it again.
Justified: Bob is a Combat Sadomasochist who enjoys inflicting pain and receiving pain, even in bed.
Bob succumbs to Evulz' torture devices as his brain just can't take that much pain.
Alice tries to seduce Bob by messaging and kissing him gently on the neck and Bob feels like he's being tortured because he doesn't like feeling comfortable physically or because even that leaves him in pain.
Bob can't get off, upon receiving physical pleasure and comfort which makes you wonder how he's even able to have sex.
Evulz tortures Bob and gets off.
Subverted: Bob fakes orgasm for a few seconds before remarking "Okay, this actually hurts."
Double Subverted: It turns out it was a joke, and he tells Evulz to keep going.
Evulz cranks it up to a billion volts, then shoves 20 swords in his head, thighs, arms, and calves, then slices him in half. Bob tells him that it was the best climax he ever experienced and thanks Evulz for having made him come so hard.
Zig Zagged: Bob laughs it off, then realizes this actually hurts...but it turns out she was thinking about something else, and laughs again, only to realize that Evulz turned up the torture dial, and this times he grunts in delight...
Defied: Evulz knows that Bob gets off on torture, so he tortures his friends in front of him instead.
Discussed: "Alright, Evulz is searching for us. If we get caught, I volunteer Bob for torture. He loves it."
Conversed: "Damn! He jeezed his pants during torture... That's one kinky number we have here."
Implied: Evulz grunts in frustration after walking out of a room as Bob is smiling contently and slowly falling into slumber, strapped to an electric chair that looks like it's been recently used.
Bob CAN actually feel the pain, and he's simply faking it. On the inside, he feels as if he's dying.
It's not (just) the pain that gets Bob off, but the possibility that he might die.
But even then, it turns out that torture that is too mild actually turns him on.
Bob's kink is a subconscious attempt to cope with the pain.
Played For Laughs: Bob has been sent to a torture chamber with a mook. When Evulz checks on them a stressed out mook tells Evulz that he isn't being payed enough for this, and Evulz tells him he's not being paid at all and tells him to get back to work. The mook nervously looks at Bob who winks at him, and the mook shudders.