Need advice on Filipina's wife cravings

I have been married to my wife (34 years old) for almost 7 years now. When we first got married at times we would watch porn during sex but she wouldn't want to watch the scenes with black men involved. it wasn't until about a year ago when I started buying some interracial videos and I noticed it didn't bother her anymore....actually what I did notice was she tended to start coming on the scenes when a black guy was fucking the girl. So recently i started buying videos where it is all black on asian and shes comes really hard. MY wife however is really shy and I'm not sure how she would react to me suggesting she fuck a black guy. I know this could put us in a weird position.....but knowing that she can reach ultimate sexual extasy just drives me wild. I would love to watch her come over and over riding a big black dick...to see her pussy get stretched and pleasured beyond what I can offer her. Any advice anyone can offer would be helpful as to how I can introduce this without freaking her out would be appreciated. Thanks in advance.