Hi, I'm a 27 years post op and I should say, don't worry.
In the first two years after srs there was just a little lubricant but after the years go by, it's more and more.
It all depends on the mood you're in.
After a while the skin in the vagina will become some kind of mucosa, that's a natural reaction of the body.
As we all know, mucosa is wet, so, no problem.
As far as I know and experience, there is no sacrify to make after srs, despite giving birth.