Gender of Wistuba's N. rajah x (veitchii x lowii)

[greenfire]

I have been growing Wistuba's N. rajah x (veitchii x lowii) clone 3 for a few years now and it looks like its about to flower. Does anyone know if this clone is male or female?

 

[greenfire]

The flowers finally opened and its a boy!

 

[greenfire]

On a side note, this is only the second Nep that I have that has red immature anthers. Another grower I know said his veitchii has the same trait. Does anyone know if this is a trait of certain species or is it random genetics within all Nepenthes?