You will need:

• a printout of the candidates.
• scissors and possibly scotch tape.

1. Cut printout into separate cards and divide into male and female piles.
   Each candidate has a rank number: the higher the number the more desirable that individual is to the opposite sex.

2. There are two possible ways to distribute the cards:
   • the candidates see the number on their card, so know their own rank.
   • the candidates do not see the number; hand to them printed side down and have a partner tape the card to their forehead. The partner only tells the candidate what sex (s)he is.

3. Randomly assign candidates to students, alternating between female and male piles.
   If the total number is odd, the instructor will participate.
   There should be some cards with random ranks left.

4. The object of the game is to find a mate (opposite sex) with the highest possible rank.

5. Form two lines of the sexes; candidates take turns interviewing a member of the opposite sex. During the interview each pair will mutually decide whether to form a mating pair or not.

6. If the pair decides to mate, they are out of the game; record the total score of the couple on the board.

7. If not, move down the line to interview the next candidate; candidate at the end of the line rotates to other end.

8. There are two possible end games:
   • Darwinian: play one round; those who fail to find a mate at the end of the round get 0 points.
   • Socialist: continue until all individuals are paired.

9. Analyze the results. Is there a pattern of sexual selection (mate choice)?

Possible outcomes for 10 pairs where only 9 pairs of cards were distributed (female 9 and male 6 not in the game):

Darwinian				Socialist
Pair	Female Rank	Male Rank		Pair	Female Rank	Male Rank
1	10	8		1	10	8
2	8	9		2	8	9
3	7	10		3	7	10
4	4	5		4	4	5
5	3	4		5	3	4
6	6	2		6	6	2
7	5	7		7	5	7
	1	1		8	1	1
	2	3		9	2	3