I've done some checking on this since I've been using regular b/c pills to skip periods with my gyno's approval and support. (I just don't take the inactive pills and go on to a new pack.) Basically when you're on the pill, and then go on the sugar pills for the last week, it's not a real period, it's a "withdrawal" period. It's not necessary because you're not ovulating. The pill halts ovulation, so there's no egg to shed. It is safe, because in the "olden days" when women were bearing children and breastfeeding year after year, they only had about 50 periods during their entire childbearing lives. Modern women have many many more than that (I don't remember the exact average number, but imagine how many it is if you don't have kids and have a period every month for what, 30-35 years? That's a lot.) Before I started using the B/C pill skip periods method, I was on Depo, which also halted periods. So I haven't had them regularly for quite a while. (I did for a short while when I tried Seasonale pills, which didn't work for me and made me bleed all the time! Not good!)Also, today's pills are so much a lower dose than the first B/C pills, there is not really much risk at staying on them continually. I've done some research on it and consulted my gyno, and that's the information I've found.
I personally HATE having a period. Mine aren't painful or anything, they're just annoying and inconvenient. I love being able to eliminate them. To me, it's one of the benefits of living in this day and age, when we can easily prevent pregnancy AND periods! I'd get a tubal or Essure, but that doesn't stop periods, and I'd still want that, so for now, I do the B/C pill thing.
Cindy