In The Sims series, Woohoo is a euphemism for sexual intercourse. It is an interaction between two Sims that is the ultimate expression of romantic love and can be initiated by Sims in any positive emotional state. Sims do not need to be in any kind of formalized relationship to Woohoo, but established partners are more likely to accept advances. WooHooing is usually good for Sims overall moods, maxing out the Social and Fun motives, although it does decrease Energy and Hygiene to a lesser extent. It will usually grant the Pleasantly Satisfied (+1) or Completely Satisfied (+2) Happy moodlets, which also boost any other positive emotional states for 4 in-game hours afterwards. Sims with the Charisma skill enjoy increased success in all social interactions, up to and including Woohoo.

There are many locations where Sims can Woohoo in The Sims 4, including beds, hot tubs, coffins, and even public places like the "Party Bush". The Sims 4 Seasons expansion also introduced the "Try for Baby" option, which is another way for Sims to express their romantic love.