Ok, lots of questions to answer. As far as the showers are concerned, there are about 10 shower heads to each bathroom. For females this is more than enough. The guys were often bitter because there were 50 of them and 10 showerheads, whereas there were only a couple of us on the entire floor. This is an aspect of ocs that was nice. Feminine products are not provided but they can easily be purchased at the NEX by you or your candidate officers, but go in with enough to get you by for the first week or two.
Watches were a pain, but everyone had to do them (except those who held certain billets in the class: i.e. adjutant, class pres., watchbill coordinator, etc. The DIs and class officers really didn't hassle you too much unless you had the 5am shift, but even then, there really wasn't much from them. There are two watchstanders at a time that guard the door and check ids. and make announcements. The people that actually grill you are the candidate officers that check you in and out of watch. It's best to know your gouge before you assume the watch.
As far as guys entering female rooms, as long as a door was kept open when in mixed company, there was nothing wrong with it. Everyone would clean the hallways, but usually each was responsible for their own room.
Ok, now on to huskie's questions. Rolling was one of my biggest fears while at ocs. It could happen for anything from injury, to failing evolutions (inspection, tests, etc.), to severe sickness. This doesn't mean that you will automatically roll, they often give you two chances to pass any evolution. There were 67 people that started out in my class and we ended up with 49. As far as the PT goes the first week, you check in on a sunday but don't PT at all until your In-PRT on Tuesday. The first couple of days are spent at medical and various other places. From then on you will PT Monday, Tuesday, Wednesday, Friday, and Saturday. I don't really know about the 80% thing, it varies from person to person. Don't worry too much about losing speed that first week. The in requirements are fairly relaxed, but it is still a good idea to go as fast as you can. I can't stress enough how important PT is. Get to the male standards while you are there and you will be greatly helped.
Hope this helps. Let me know if there are further questions,
Kate