I got an idea. The 7 boys all rank the 7 girls in order of attractiveness from 1 to 7. All their 7 scores are added up and then the 7 girls will be ranked. The girls then have to guess who the boys put as the most attractive to the least attractive.
The same will happen for the boys too. The girls have to rank the boys in order of attractiveness and the boys have to guess who the girls put as most to least attractive.
If they get 4 out of 7 or more positions right they all win a prize??
Sounds good