Even if it was possible without sensation loss ... by how much would you reduce it?
And remember, a lot of relations have an end. I for example had 3 longterm relations (+5years).
So now you reduce it, and in the next relation enlarge it, and so on...
You must not adjust your member to your partner, but adjust your sex life together with your partner.
If lenght is the problem, just a simple 'donut' is one of the solutions, many $ cheaper than an operation and not irreversable.
If girth is the problem, lube and a slow start...as 1 of the many solutions
If premature ejaculation is the prolem, condoms with lidocaine or benzocaine...
If delayed orgasm...
For every problem in bed you can find together a solution to have a good satisfied sexlife.
But like jeff, I smell a bad odor, as this is your first and only post.