Divide the couples up for various "battle of the sexes" trivia games. You could play a "Family Feud" type of game in which each team tries to list as many correct answers as possible based on a given prompt. If a team gives an answer not listed among preset responses, the other team has a chance to steal their turn. Make the questions related to what girls and guys like, as well as relationships. For example, you could give a prompt like, "Excuses guys make to get out of doing something with their girlfriend." You can also play a version of the Newlywed game. Give each person a list of questions related to his or her partner or the relationship, which couples must answer separately. The couples then sit together and reveal their answers to see if they match. The couple with the most answers that are the same wins.

You can play charades and divide everyone up into two teams of couples, or each couple can be their own team. The person whose turn it is must stand up and try to inspire his or her team or partner to guess the word or phrase he or she has been given, using only body gestures. Try to come up with words or phrases related to relationships, such as "first date" and "falling in love." You can also play a drawing guessing game, where participants must draw images related to the word or phrase instead of acting it out, or you could play a version where you can only verbally describe the word, without using certain words too closely related to it.

Depending on the amount of space you have, you could host a small or large scavenger hunt with the teams searching for romantic-themed items around or outside of your home. You could hide things like a flower bouquet, a teddy bear, a heart balloon, a romantic song compilation CD, and Valentine's candy. The couples race to find as many items as possible. Raise the difficulty by only putting out one set of items, so if a couple gets to an item first, the rest of the couples are out of luck. Leave markers indicating an item is gone so the other couples will know. You could also plan a treasure hunt around your house with personalized clues for each couple. The couples must answer a question correctly about each other in order to be led to the correct next clue. The team who completes the treasure hunt first wins.

Get all the couples laughing and competitive with a bunch of goofy contests. You can plan a series of small competitions that the couples earn points for based on how well they do in each challenge. At the end of the night, the team with the most points wins and receives the ultimate prize. Get creative and brainstorm crazy ideas. For example, the couples have to successfully pass several pieces of fruit to each other or into a basket using only their necks. Other ideas include competing to build the tallest card tower, maneuvering a cookie from their foreheads to their mouths without using their hands, and blowing ping pong balls into position on small "X's" taped to a table.