From the box:
Each Sex! card explicitly illustrates either a foreplay activity or a sexual position. While playing one of the three Sex! card games, you and your lover use the cards to plan out one of the 100,000 possible fantasies. After building a fantasy, you both act it out.
Sex! can be played three ways. Compete to build an ultimate night of passion by playing Ultimate Fantasy, let fate decide your night with Fortune Teller, or build your fantasy while learning about your lover's likes, loves, and lusts with Lover's Libido.