Closest it comes to nudity is when they shower. They do a Wonder-Woman-esque twirl and a black censor box appears over them. That's it.
There's no actual spoken language, so no worries there.
Closest thing to violence is that it is possible to kill the sims off via household accidents, maliciousness, etc... I became a serial killer at one point and invited everyone in the neighborhood over for a pool party. When everyone was in the pool, I paused the game and sold the ladder. No ladder means they can't get out of the pool. Everyone eventually exhausts and dies. You get tombstones to decorate your lawn for doing that.

My first sim died due to household accident. Her cooking sucked and she caught the stove on fire. I'd not bought a fire alarm yet and the phone and only escape route were through the flames. She croaked.
