Sunshine - that's interesting. I used to get very depressed on the pill. I'm not about to get rid of my DH, but I do agree that lifestyle factors do come into it. I've just started taking starflower oil and oil of evening primrose, both of which help to regulate hormones.
I'm also not embarrassed about periods, and make a point of talking about them in the same way I talk about most things, but, when I'm not suffering from PMT, I do joke about how vile it sometimes makes me.
I don't think its the same as depression, and I say this as a nearly life-long sufferer of the dreaded Black Dog, simply because it has such a different cause. However, even if it were, why does that make it sexist? Is it really sexist to joke about something that only affects one group of people? Are we only allowed to joke about something that affects everyone equally?
And can I just add this disclaimer: I am arguing this because I am really interested in working it out, not because I think anyone is wrong, and, as many ppl on here will testify, I am a feminist, through and through, but we're all learning all the time, right? And the best way of learning is through intelligent, open-minded discussion.