You asked a very tough question to answer. It used to be that
I could tell a male from a female by the shape and coloring
of the leaves. The males generally have a more vibrant green
coloration. Now, with the advent of Kiwi crosses, hardy
versus non-hardy, fuzzy versus smooth skin, that issue has
become clouded for me with my being out of touch with this
fruit for about 12 years. There was a variety in the nursery
trade years ago that was self fertile, meaning it could produce
fruit without a male counterpart but I will have to do some
real digging to find the name of it.
I have not been able to find an answer for you online either
from a variety of sources. I always felt the size of the flowers
on the males could tell me what I needed to know as far as the
sex of the plant.
Here are some URLs for you to look at. I think the only
real way to know if your plant is a male or a female is to
see it in bloom.