I haven't been able to try to do anything as of yet but I am a rather open person, except for doing things with another guy
( I'm not that open....)

I'd like my girlfriend to use a strap-on on me from behind, i've put objects up my ass before and it felt really good. The furthest I have had a chance to do with my girlfriend is have her finger me back there, and I love it...

Yes, I do feel ashamed in a way because of all the social taboos and all but like my girlfriend says, I am letting a woman do that to me, not a guy so I don't feel as bad anymore.

I also want her to use a vibrator on me while I was tied down, just to torture me. Usually I play the dominant one in our relationship in the bedroom since she likes it but I love to let her play Mistress too. She could use the vibrator and tease me, use me like a cheap plaything ya know. The idea turns me on really badly...