There are no sexual things in D&D by default. It's brought in by players and can be left out simply by not saying anything about it.
Violence is baked in, though. But the descriptions are still left upto you.
Just make up a simple quest and DM yourself, so you're in control of the details. Like a fairy queen wants her to rescue a kidnapped unicorn from some goblins. Along the way she encounters some centaurs at war with orcs, and a friendly half-orc who is falsely accused. And then let the story build around her actions.