It should generally be placed after any other NPC appearance overhauls but before a "Bashed Patch" or "Smashed Patch" to ensure its changes take priority.

Using protection leads to "Responsible Woohoo" moodlets, while skipping it carries a realistic risk of pregnancy that matches the Sim’s fertility levels. 4. Better Kids' Gameplay

For those who want more "life" in their life simulation, the mod introduces and protection options: