Attraction
Paternal age and attractiveness of offspring http://personal.lse.ac.uk/kanazawa/pdfs/PAID2017.pdf
Older dads produce ugly children?
Wives with masculine husbands more satisfied
http://www.dailymail.co.uk/health/article-4499864/Wives-masculine-husbands-satisfied.html
Women buy sexy clothes when ovulating.
http://www.dailymail.co.uk/sciencetech/article-4567652/Want-buy-sexy-clothes-hormones.html
Proxies
- BMI
https://blog.photofeeler.com/category/photo-battles/
http://www.dailymail.co.uk/sciencetech/article-4465614/Are-gay-sex-preferences-biological.html
Scent and sound are just as important as looks when it comes to sex appeal
http://www.dailymail.co.uk/sciencetech/article-4518162/Voice-scent-just-important-looks.html