Teenage Sims cannot "Woohoo" without the use of a mod, which is a game add-on. When it comes to romance, they can do everything up to making out.
"Woohoo" is a term used in The Sims series as a euphemism for sexual intercourse. Any two adult Sims can engage in "Woohoo" interactions if they are romantically interested in each other. "Woohoo" has an impact on the mood and emotions of Sims. It is often an important even in their lives, especially when it occurs for the first time with a new partner. Besides not being able to engage in "Woohoo," teenage Sims cannot become pregnant and can only date other teenagers.