Well I think you can get them in some other ways. As an example I think Butt Slap counts as an "physical attack". But not sure, never really experimented much with Masochism for a while. And Sadism well you will tend to get a few Orgasms via Battles in a Fighter Build.
I think that butt-slapping might be a separate fetish, judging by the way you're able to add starting bonuses to Karryn (either she secretly desires to have her her butt slapped or to be treated badly by vulgar men). Also, I am currently building up a Warden who is an all-things-butt-related addict and a pussy denying virgin as well. Everytime there is a thug, she assumes the position with her butt held high (meaning give up at butt desire 75+) to entice them to whup the living daylights out of her booty, which they usually do, with occasional kissing and boob rough-handling. Quite a submissive conduct, if not a handbook example of pure erotic masochism. She came while spanked numerous times, yet her masochist level did not budge. On the other hand, getting trapped in handjobs loops she did not initiate somehow increased her Sadism.
Based on my experience of playing other manga-style games with violent elements in them, I noticed that S/M dynamics are often misrepresented and defined simply as enjoyment of giving or receiving pain, any pain regardless of sexual context or lack thereof.