I love bringing friends on rides (girls obv) and my girlfriend loves to ride and is working on getting her own bike currently. she knows the ins and outs; leans correctly, looks through the corners and doesn't fidget to much. makes for a much more enjoyable ride when the passenger knows what is going on. Just don't drive like an idiot and take into consideration the added weight and you should be fine.
So my wife use to ride with me on my Harley.. Well she thought she was going to start riding with me on my Gsxr. Of course I’m going to let her, so I buy her the Icon Alliance GT and some Icon D30 riding gloves to make sure she’s protected. Long story short, she rides on my bike for 10 minutes and hated every second of it.