Not sure if this will help but I've "introduced" plugs to a few girls. I've started out by getting on the topic of what turns you/her on. It sets the stage to talk about things you don't know about each other that gets them going. (may vary since you two are dating already) But then you can coyly say that a girl wearing a plug does a lot for you, most girls have never tried or even seen one so she may not know what your talking about. (I also usually say that giving oil massages also does it for me, most girls will jump at an opportunity for a free massage) That is when I have offered to show them the plug, I would go and pull it out of its bag, she'll laugh and be like "it's scary" or whatever and you can reassure her that it's not that bad and that she outta give it a shot. Then where I go from there is to say "How about this, I'll give you an oil massage if I can put the plug in." (I typically use coconut oil, its readily available at grocery stores everywhere and can easily warrant a sexual-ish shower afterwards) From my experience I think most girls adventurous side comes out and when coupled with their love of massages they are willing to try! If you don't know how to give a massage just google it, it's super easy and it doesn't matter at all how good it is. The oil can be a pretty good lubricant and the massage will most likely get her going. While she is on her stomach you can talk with her and try out the plug. She'll most likely be rather turned on and also very relaxed from the massage. (ideal for trying a plug) As I said I am not sure if this helps but I've done it in this fashion a couple times and its turned out well. Communication is important and spending extra time to get her ready for the plug. Good luck, hope this helps!