I am sexually active and it has changed massive amounts. If you watch my monthly update videos, I describe pretty much everything having to do with my genitals. After my genitalia grew a bit, it became more sensitive so any stimulation felt really good. Almost any stimulation made me have an erection as well. However, it feels a lot different. I don’t really know how to describe it, it’s just a lot different. 
When it comes to orgasm, in my opinion, it doesn’t feel nearly as good as before I started testosterone. Before, it was like waves of tingly sensations either around my genital area or all over my body. Now, it just feels really good only on my genitals for a few seconds and then I get tired. 
Also for the first time, I was recently able to climax by someone else stimulating me. Before, even having been in a sexual relationship for over a year, I had never reached orgasm. Testosterone might be a contributor in that but I’m not sure. 
Something that’s also changed is the overall texture of my genitals, not only the size of my clitoris/penis. The outer labia feels more like the texture of a scrotum. Also, the discharge is a more stringy texture and a lot more of it comes out but only after I’m really really aroused. Before, discharge occurred randomly or if I was slightly aroused.