Actually cellophane (and everyone else) the reasons my doctor gave me for not putting IUDs in women who haven't had a baby/abortion were:
A) When you've not had a baby, your uterus is not used to having anything in there, thus leading to an increased risk of expulsion of the IUD (something like 5% for women who have never been pregnant vs .5% for those who have). The risk of expulsion (or "rejection") is highest within the first six weeks of having the IUD. The way they put the IUD in doesn't involve any widening of the cervix. They wait until you're fully on your period (because that's when your cervix is most dialated) and then they do two things that involve your cervix opening- they sound your uterus (poke a little prod in there to figure out how deep your uterus is so they know how deep the IUD should go in) and insert the IUD (see
www.paraguard.com for all the IUD info you could ever need).
B) When you're not in a monagamous relationship, it means you will probably be having sex with more than one person. This means you're at a much higher risk for contracting an STD, which is INCREDIBLY bad if you have an IUD. The reason (as far as I understood) that was given for this is that when you have an IUD, if you get Pelvic Inflammitory Disease (basically if any bacteria gets in your uterus and causes an infection) there is a huge chance the IUD will become embedded in the walls of the uterus, perhaps even puncturing the uterus. This can lead to sterilization or being very very sick with a very nasty infection. So, if you aren't sexually stable, they don't want to take the risk of exposing you to a potentally horrendous expierence.
And yeah, it hurt a lot to have my uterus sounded. But I've had worse menstrual cramps, and the fifteen seconds of pain was totally worth it to have ten to twelve years of no babies and no hormones.
Bottom line: tres, get your girl to the gyno ASAP!