A nurse googles and finds nothing. Ergo, there is nothing to find. Sigh.
I've been puddling around in Cochrane, there are studies relating to this.
The term to use is Nullipara or Nulliparous
There is more in Pub Med --sometimes you can only get at the abstracts if you don't have a log on.
https://emedicine.medscape.com/article/1945957-overview Medscape will give you access to limited articles as a guest
This stuff may not be helpful, but some of the references are very good and may give you some language tools if you feel like you are being fobbed off when you want to ask more specific questions.