In my experience it's a good sign that she is ready, I been doing it for only 2 to 3 years and watched my wife fuck numerous men, prefer not to say a number haha.. she will be nervous and extremely hesitant cause she will think she will be judged, feel like you will change ur ways with her or simply scared of stepping the boundaries of the unknown. My advise will be take it slowly but be extremely open with eachother, figure out what she really wants and what u want, a relationship will have to be strong to withstand such an adventurous sex experience such as fucking her with another guy or having her fuck a guy and come home to you, or what ever u desire in that extreme. My wife and I use rules and we follow them to the T.
We have followed the rules that we both have created and negotiated with over the years and it's definitely worked for us. We are happier, more open with eachother, more open to ideas and adventures in the bedroom and most of all the sex life is amazing and so satisfying .
We have been together for 8 years and we always experience new things and I love watching how different guys fuck her and how much they cum.
Lol her current fuck buddy cums and fucks so good so she is sticking with him whenever we are adventurous as you can see in the pic..
These are from last night's adventure. If she sees this and reacts nice to this and wants it then give it to her