I wish I could talk my wife into having sex with a

I've been trying for years trying to talk to my wife having sex with another guy and let me watch and join in later. She was going to let me before a while ago, but the guy she wanted to fuck past away. Since then she hasn't flirted with any other guy. It turns me on when she talks dirty to other men, but now these days, she don't masturbate like she use too and sex isn't that fun anymore. Its hard to keep it up when she isn't getting me excited about something. If I try to talk to her about another guy fucking her while having sex, she tells me to keep it to myself or I'm killing her mood. What about my mood, I'm the one with a dick that can go soft and once that's down it takes forever to get hard again. I've been fucking the same pussy for 16 years. Sometimes I think she did fuck another guy, I know she got mad at me one day and I think she had a guy over or she went over to his place and fucked him. It could be just in my head, like everything else. She likes guys with dark hair and she really likes cowboys. I would love have someone fuck her but she won't let me.