It's not just women who have periods, but trangender guys have them too. Being a t* guy, I wanted this app since it didn't have a pink, girly, prissy design to it (regardless if I have periods, I still wanna feel manly about it, and the pink frilly apps don't let me avhieve that). I'm not in the slightest trying to conceive (AT ALL), hell, I'm not even in a relationship (and I'm not thinking about it).