http://www.bbc.co.uk/news/science-environment-36756107
I confess my first thought at the subject line was along the lines of "how do you tell that from a skeleton?!?"
;D
They can do wonders with DNA testing these days ...
[Edit:] And here is the scientific 'proof' (https://www.theguardian.com/science/2016/apr/18/genes-influence-the-age-at-which-you-lose-your-virginity-first-sex-dna)! ;D
indeed.... :o