I've considered what you're talking about. Putting a sort of option-out survey at the beginning of the game. The code, like you say, is not really that big of an issue.
It's more of what Kionashi said above - that if I give you the option up front to turn everything off, you might feel safer, but you might miss out on things that you could end up liking.
For instance - Adrian.
I'm sure, if I put an option at the beginning to turn off transgender content, there would be a lot of people who would choose that. That's fine. But I have received a lot of messages since Adrian came out, from people who said basically, "I didn't know that I was interested in that, but maybe I am?"
Basically, I'm not trying to push anything on anybody, but broadening horizons is a sort of goal of mine with the game. Things like sharing, transgender women, bisexual relationships, femdom, "daddy" talk -- among other options, including a couple of new ones in the upcoming update -- I'm hoping this will open some minds and maybe people will discover things that they might enjoy, that they didn't know they would enjoy. Or at least be more accepting of those things.