Being that I'm in the neighborhood of her age group I can tell you that there's a high probability that she wouldn't be interested (at all) in that. I'm sure there are women her age who are that adventurous but they are few and far between. I don't know any college female friends who'd want to have sex with another guy, a stranger, regardless of race, in front of their boyfriend. If she wanted that I doubt it be too difficult for her to go out and get it. I think you're watching waaay too much porn and need to be thankful for what you've got. It's not as if you've been married for 15 years, sex has become boring, and you want to spice things up. She fucking 19 for christ's sake. The best you can hope for is what someone already suggested, that being, toys. It's a lot safer bet and she unlikely to dump your ass upon the suggestion.