Yeahhhh....they have their ways and you pry don't wanna know some of them lol. Buuuutt some might also have IUDs that make periods fairly rare. When I did the birth control pills way back when if I didn't want a period I just kept taking the active hormone pills during the time you are supposed to take placebos. We will just assume their situations are one of the latter two scenarios for peace of mind yeah?
I had a guy get pissed off at me because I cancelled on him when mine came once- like it was my fault and I did a dance to make it happen or something. *sigh* On the plus side that's 2-3 days I get to go without shaving my legs muahahaha
and one dude that's in for the time of his life once I'm "good to go" again!