This is exactly right. He has broken down a serious taboo already, as these women are now discussing these health issues among themselves. Even beyond that, they are taking it upon themselves to educate and empower other women and girls on these issues. Soon (if not already) the women will start talking about other issues in their community. Think about it: once you've talked about something as private and personal as a menstrual cycle, what other topics are really off-limits?

Also: never underestimate the power of convenience. These sanitary products make it much easier for women and girls to work, go to school, care for their children, and a whole host of other things. Things that make life easier for women have a way of catching on in communities.

+1

and also it's less frightening for a young girl (say, 12 or 13) to purchase from an older woman than an older man. In straight marketing terms, it's great for creating rapport and point of reference.