Before trying to determine the percentage of "accepting SOs", one would need to define the term "accepting". "Accepting" could range from "it was her idea in the first place" to "grudging tolerance" and everything in between. And even the term "SO" needs to be defined because a woman's attitude can often change from the time she is a girlfriend and the time she is a wife and mother.
Further, acceptance can be based on the level of crossdressing. A SO might be OK with panties but not with a bra, breast forms, butt padding and a wig.
Some web software allows for polls (I don't think this one does), but even that would produce questionable results without the above definitions.
