Where do is sign up

I want to get used by a large dicked trans, males just don't do it for me, but I want to know what it's like to taken by a domineering woman. This is a new thing for me, since Quitting Hard drugs in the 2000s I haven't had any sexual urges until I started taking prescribed meds (not sure which one is causing this) but now I'm a massive sub and I have no idea where that comes from. My wife has told me multiple times through the years that she will never top or go near anal plus she's also super submissive.