Electronic Arts maintains a zero-tolerance policy regarding the depiction or sexualization of minors. Engaging with such content can lead to the termination of an EA account.
If you're specifically looking for a mod that allows child Sims to WooHoo, you should be aware that the Sims 4 base game and official updates do not support this due to the game's rating and intended audience. However, there are mods that can change or add behaviors to Sims of all ages, but ensure they are used responsibly and at your discretion. sims 4 mod child woohoo
If you are looking to make the "Child" life stage more engaging, many popular and safe mods focus on realistic childhood experiences: Childhood Aspirations & Skills sims 4 mod child woohoo