she is open in talk about sex in general, but not about what she want.
Look at the positive, here ... she's still willing to have conversation about the topic, and not getting upset. So basically, she's looking to you to give her a good, logical reason to move forward. Treat this opportunity as a jigsaw puzzle ... the answer is there; you just haven't found it yet.
Married women, particularly those with an established family, tend to apply more logic and common sense to these kinds of discissions. She probably feels she has a lot to lose if you react in the wrong way when she takes another man to bed. And to be honest, I think she's justified, as I, also, don't think you
really realize how you may react when she takes another man for sex. You might think you do, but you possibly don't. There are a lot of emotions created when this event happens, some of those are negative ... like jealousy of enjoying it, her aggressiveness of being with a new man, etc etc. Does she wish to risk her happy marriage over a crazy idea that you WANT more than she does?
A good marital relationship is built on a solid foundation of trust and honesty. Until you establish those within your marriage its very risky to bring in outside entertainment to stimulate your sexual desires. So, it's good you desire to get her to verbally & mentally open up
before perusing a 3rd person to your love crib. You really need to crack open her sexual fantasy box and see what SHE finds extra-stimulating. Everything will work out in the end if you use patients and understanding. Just keep in mind that this is mostly a fantasy to most people, and like fantasies, eventually will stop having the same excitement once fulfilled.
I'm sure you have some swinging lifestyle clubs around; I'm pretty sure they do in Naples. Why not take her to a "hospitality night" event where the club is desiring to bring in new members. Having casual talk with club memebers over a few drinks might be the thing that gets her to open up. Just let her move at her own pace. Usually, club members are clothed in the hospitality area to help relax the attendees.
I really encourage you to remain patient and let this happen naturally. Some things are just worth waiting for. Mac