Any woman who is THAT forward just comes across as desperately trying too hard. I don't care how hot she is, that'd be a major turn-off for me right there. She's acting way too crazy and desperate to get this guy to agree to anything.
I'd be wary of it being some sort of honeypot scam, so I'd never fall for something like that.
Instead, if my wife wants to test my loyalty, she should ask that girl who I used to work with to reconnect with me on Facebook, and chat with me a bit, and then have her complain that she's been really lonely ever since she broke up with her boyfriend because he was a cheating sleazebag, not a good guy like
I am, and maybe we could grab a coffee sometime, and I wouldn't necessarily need to bring my wife along, she doesn't have to know...