“It’s quite striking that, despite the industry's drive to become more responsible, it often neglects one of the most basic needs of its female guests,” says Affi Parvizi-Wayne, founder of Freda, a London-based eco-conscious period care company.

Downton Abbey is the much-loved British drama series which ran for six seasons from 2010 until 2015, and starred Hugh Bonneville and Michelle Dockery.

Importantly, they found maternal and paternal exposures influenced timing, but it was the father’s contribution that stood out. “While we found that both the mother’s and father’s exposures were linked to when their daughters and granddaughters began puberty, the father’s influence was surprisingly strong,” Hu said.

Set in the 1930s, a new six-part BritBox series tells of the infamously non-conformist Mitford sisters, whose involvement in various political causes roiled their aristocratic parents.

Wondering why your period smells stronger than usual? Learn what’s normal, what may signal a problem, and how to manage odor with confidence.