Hi 2Know, Its because your hormones are raging, and you want it, so just go grab your boyfriend and take him, just tell him you need it.
Good Luck
Thanks, that helps a lot.
The extent probably varies a lot between one woman and another, but I believe this is a fairly common experience - I'm sure I've read about it at some point, and I have witnessed it in past relationships that she's been more horny at that point in the cycle.