Most tabletop roleplaying games have mechanics about killing things but no mechanics about sexual violence, so that tends to set expectations too.
...then you probably won't succeed anyway, as triggers tend to be random associations.
Source?
And a murder-victim-to-be still probably wouldn't be triggered, since s/he hasn't "experienced" it yet.
That's how I interpreted the comment anyway :)
Sometimes players justify their actions with "but that's what my character would do"; there is a popular rpg.stackexchange post about it: https://rpg.stackexchange.com/questions/37103/what-is-my-guy... .
I think you expect fighting but rarely sex in a game.
But then again, what about the second-order effects on friends and family as a result of either sexual abuse or violence? Maybe the trauma belonging to the survivors themselves simply overpowers the rest (or not). What about people who survive murder attempts? Maybe being taken advantage of and treated as powerless applies more to sexual than physical trauma, since there are many cases where physical violence is the result of both sides retaliating in equal measure, or sometimes honorably, like for sport. I'm not sure.
Also, I don't agree with the example: Steve wouldn't be invited back after either act. YMMV.
Rape, on other hand, could hardly serve any acceptable in-game purpose (or real life purpose for that matter). Its purpose is to terrorize and psychologically maim -- something you never need to do to an NPC. An ally who rapes someone in-game is not furthering the quest, and moreover is doing something that is well outside the bounds of typical PC behavior.