What gets the both of us excited:
Well nowadays it's mainly about teasing and exposing. Examples:
- Going braless more often, not only at home but also in public.
- Going topless or naked at the beach and sauna.
- Going topless and naked on cam while a cam friend of ours is watching
- Wife sending me topless/nude selfies once in a while. So far I've only shared those with our online friend, but she secretly would love for me to show them also to someone she knows (so she can pretend she doesn't know next time she sees that person).