When I use to have periods most of the time I would still have sex with my partner... I would often have to take some pretty strong pain killers from the doctors to get through it though, but I did find that having an orgasm would often help with the pain. I didn't really get emotional or angry around my period like some.
I don't get periods now, I'm not on any form of birth control, my body has just decided to work differently right now... I was actually a bit worried when they stopped at first and kinda stressed over it a bit, until my OH pointed out that it's a good thing as it means I'm spending less on tampons, there's less of a clean-up to worry about after sex, and I don't have to take powerful pain killers. Though, a note with the clean-up factor, sex is messy throughout the month, regardless if you are on your period or not.