"Behind every great woman is a great, embarrassing first menstruation story."
-- Happy Campers (2001)

Menarche: the first menstrual cycle/menstrual bleeding. (I did not even know this word existed until I read the Carrie Wikipedia).
I get the idea that Letterboxd is pretty male-dominated so I can imagine some brains shrivelling quite a lot now, but it had to be done. Suggestions welcome as always.

Also check out Rosalind's most excellent mis-info-gyny-list.

Click "more" for television episodes and other (short) films centring on related to menstruation (Period Poverty, Premenstrual Syndrome, Endometriosis)

Not on Letterboxd:
The End of Flowers (Arianna De Giorgi, 2005)
The Womanhood (Yvonne LaBarge Nichols, 2012)

Menarche in TV/non-film:
7th Heaven (S01E01, S07E22); According to Jim (S07E07); Alias Grace (S01E02); American Princess (S01E05); Anne with an E (S01E05, thanks Indiana!); Big Mouth (S01E02); Black-ish (S04E06) (Vulture & Bustle articles); Blossom (S01E01); Californication (S01E12); The Cosby Show (S07E08); Curb Your Enthusiasm (S08E01, thanks Mark!); Degrassi: The Next Generation (S01E09, thanks antiunna!); Game of Thrones (S02E07, thanks James!); I'll Fly Away (S01E03)l Little Mosque on the Prairie (S01E02); Mad Men (S05E12); Penelope, Princess of Pets, Kristen Schaal's web series (thanks Graham!); Ready Or Not (S01E03 'Busy's Curse'); Roseanne (S01E15 'Nightmare on Oak Street'); Superstore (S01E05); Ted Lasso (S02E03, brief mention); The Thorn Birds (S01E01); Trust Me (BBC 2017, thanks Mark!)

(Short) Films on issues related to menstruation (Period Poverty, Premenstrual Syndrome, Endometriosis):
Period. End of Sentence (Rayka Zehtabchi, 2018); Period Poverty (Pascale Kann, 2018); Pandora’s Box: Lifting the Lid on Menstruation (Rebecca Snow, 2021);Vlekkeloos (Emma Branderhorst, 2021); Birdland (Ashgan El-Hamus, 2020); For the Sake of Calmness (Newsha Tavakolian, 2020); Not Ovary Acting (Holly Sanneman, 2020); A Bloody Mess (Asis Sethi, 2019); About Bloody Time (Wesley Francis, 2018); Pad Man (R. Balki, 2018); Phullu (Abhishek Saxena, 2017); End-O (Alice Seabright, 2019); ENDOMIC (Camille Hollett-French & Ipek Ensari, 2021); MyEndo (Ellen Andries, 2020); My Invisible Illness (Matthew Lowe, 2021); Endo What (Shannon Cohn, 2016); A Thousand Needles (Kelsi Brooks & Gwamaka Mwabuka, 2018); Bo ladnie pachnie (Jakub Mainski, 2016); The Painful Truth - A Film About Endometriosis and Adenomyosis (Steinar Hybertsen, 2018)