it happens to me a week right before and afterwards. i think it's a natural thing b/c those couple of weeks are your most fertile times of the month and it's mother nature's way of attempting to multiply!
I think it's normal b/c I'm always crazy turned on right before and during my period. The problem is my husband would die before having sex while I'm on my period so I'm always SOOO lonely during it, my horniest time of the month!
In my experience, and a couple other women I talked to, they also found that having sex right before 'get's' you your period. Like, often they have PMS, and they are waiting, and waiting, and then having intercourse does the trick. of course I have no evidence for that, but I thought it was an interesting observation.
I have a hysterectomy so I do not have periods any more but I can say I would almost rape my husband before my period in the past. That is very normal.
if you do have intercourse at this time?
that is very normal, i feel like a cat in heat right before my period!