Thats too cool. I can't wait till I can do that someday. Right now I only have one Nepenthes so I can't do it yet. But once I get my greenhouse built and get more there won't be any stopping me.
I would imagine that the chance of having a female and a male flowering at the same time and being a different type of Nep. would be pretty hard if you only had a few plants though.
In general, do they flower at the same time or is it all over the board?