Well;
I have not had SRS as I am pre-op, but after more than 2 years on HRT,I always sit as its impossible to stand as I am now really tiny down there and basically if I was to stand, I would have to drop my jeans to find it.
One issue I have noticed now though is that quite often it dribbles backwards because of how tiny everything is. Mind you now wearing tight women's skinny jeans and shorts with a gaff on, my "Vulva" looks quite flat!