Data driven using research like this: http://www.mendeley.com/research/female-preference-for-male-faces-changes-cyclically-further-evidence/ http://www.mendele

Data driven using research like this: http://www.mendeley.com/research/female-preference-for-male-faces-changes-cyclically-further-evidence/ http://www.mendeley.com/research/female-preference-for-male-... http://journal.nida.ac.th/journal/attachments/8_Sunthorn%20Kanghae.pdf http://journal.nida.ac.th/journal/attachments/8_Sunthorn%20K... http://psycnet.apa.org/journals/com/108/3/233/ http://psycnet.apa.org/journals/com/108/3/233/ Also would provide an option for you to rate 10-20 and give a personal rating.