"I have no idea why Proctor & Gamble thought it was a good marketing tactic to alienate their sole customer base in this way."
Kellie-Jay Keen-Minshull, founder of the Standing For Women campaign group, said: "They are virtue signalling. It's quite frightening. When you try and include all identities into womanhood, you ultimately exclude women."
It comes after high street chain Superdrug last month unveiled a new range of sanitary products "for people who menstruate".
In June, JK Rowling was accused of being "transphobic" after insisting only women experience menstruation. She had challenged an article entitled: "Opinion: Creating a more equal post-Covid-19 world for people who menstruate.
Proctor & Gamble did not respond to requests for comment last night.