Thing only girls understand:  Being on your period and being sexually frustrated. Its like

Girls: "Okay im on my period you better get over here and kiss me right now but don't fucking touch me. Just don't touch me! Fucking kiss me why aren't you kissing me?"

And

Girls: "I'm in my period you better be over here whispering sweet and sexy things in my ear. But don't fucking talk to me. Don't touch me. Why aren't you whispering sweet shit to me? Don't fucking talk to me!"

Guy: *crying* what do I do?! *runs away crying in confusion*

Girls; the fuck you doing?! Get back here and deal with me!