Mube (Stauntonia hexaphylla) sexing/fruiting question

[ragenmoan]

I bought a couple Mube vines I've been training semi-cascade style. They flower every year but I have not seen them bear fruit since I got them 5 years ago. I've read fruiting requires both male and female plants. Anyone how the tell the difference between male and female plants? The flowers are fragrant and the mature fruit is purple.

 

[Wires_Guy_wires]

The English wikipedia is pretty much lacking all information.
But the German one is pretty helpful:

Die männlichen Blüten besitzen sechs Staubblätter, deren Staubfäden verwachsen sind; Kronblätter und Nektarien fehlen; die Kelchblätter sind etwas kleiner als bei weiblichen Blüten.[2][1]

Now my German is terrible, but it says the male flowers have six fused stamens. Petals and nectaries (produce nectar, you can taste it) are lacking. The sepals are smaller in male plants.