When She Says “I want someone stronger and masculine”

Hi all! This is my first time posting here. I am 30, and my wife 28. We have been married 2 years now. She is very active in sex. We enjoy wild sex sessions. But everything changed when one day she went to a party. She was wearing a black dress. The dress was sexy and a bit short. Out of no where one men approached her when I was talking to one of my friends. That guy praised her, flirted with her a lot. That night after we came home, my wife became wild crazy for sex.. while we were having sex, she said “I want someone stronger and more masculine over my naked body”. I thought I would add more spice on it. I told her “yeah that would be a wild scene to watch!”. She instantly replied “I have someone in my mind who would fuck me right now if I call him now. I want to get fucked by him right now. He is handsome, strong, and I am sure he can fuck my the way I want.” I was totally baffled. We had a wild session that night. Since then she started wearing revealing dresses. I can sense that she is into other men. Lately, I started feeling like I would love to watch her being enjoyed by another men. I would love to see someone giving her the pleasure and making her satisfied.. We fantasize a lot during having sex. But the problem is, when I ask her to really try someone, she says she is afraid, and shy. I asked her to contact that guy. She says she doesn’t have his number. All in all, she is interested, I am interested in sharing her, and watch her having sex with another men. But the problem is she is too shy. Any tips on how to make her do it?