Does your wife like to hear Gay Stories, especially stories that involve you? I was in the wholesale apparel fabric business and was surrounded by gay guys and ladies. She loved to hear me tell her how someone came onto me and wanted to hook up. Once I started to mess around with her old friend, at her encouragement, she became facinated with wanting to know every detail ,eventually watching. I don't know of anything that gets her as worked up . I almost do it just for her.
Not necessarily gay stories, but my wife was interested in hearing the details of my mutual sucking when I confessed to her early on in our relationship. How often, what favorite position, what was my biggest, do I swallow, how many inches can I deep throat...stuff like that got her turned on. Then when she said she wanted to watch and participate she really got turned on.