Standing on the other side of this issue, it is a lot easier to talk (write) about. I wasn't sure I would want to post about this issue because it is a little embarrassing but I think that is the reason it never gets discussed. The fact is that 30-50% of women will experience urinary incontinence after labor. There are two types of urinary incontinence, one is where you leak urine while laughing or coughing (this apparently also occurs during pregnancy in some women although I didn't experience it) and the other type that affected me is where the 'urge' to urinate is lost and therefore your bladder just empties without any warning. This happened to me in the hospital, it was late a night and Colin had fallen asleep on me after nursing so I didn't get up out of bed for a while. As soon as I did... well I'll spare you the graphic details but you can imagine the scene. I of course was horrified and start tearing up (remember hormones still out of whack) thinking I was permanently broken. I should mention at this point that my bladder had suffered some trauma earlier that day when my catheter tube got blocked and therefore my bladder wasn't emptying for quite sometime, when I finally started to get uncomfortable and alter the staff it took them over an hour to correct the problem (July is when all the new resident doctors start so they weren't really on top of their game yet) once corrected they emptied 1500 cc's out of my bladder. I looked it up and the average bladder holds 300cc's so clearly I was a bit over extended. I thought my issues were related to this but once I started looking it up it probably has just as much (if not more) to do with actually giving birth to a 8lb + baby. After coming home I did continue to have some trouble with it the first few days, nothing like what happened in the hospital but enough to really scare me into doing the research on it. It is apparently one of the arguments for elective cesareans because in some women it doesn't improve, or gets better but returns much later in life (there is a reason most adult diaper commercials are geared toward women). Apparently it is more likely to occur when you have a baby who is larger than 8 lbs or an episiotomy (although I'm not sure exactly why an episiotomy is related).
So now consider yourself warned... having a baby vaginally could lead to urinary incontinence, but it is not necessarily a permanent condition so there is no need to freak out if it happens to you.