I'd try just about anything, but even I have my limits. Here are some things I wouldn't be willing to try.
*Scat (although I'd be ok with golden showers)
*Anything that involves something going INTO my penis
*Torture (meaning anything that causes extreme pain for either me or my partner, light S&M is OK though)
*Beastiality
*Wife swapping (I could never share a woman)
*Threesome with another guy, or an Orgy (see above)
Are you trying to get your boyfriend/hubby to do something?