really odd topic: Polyjuice Potion: Gender?

[zoomphy]

No: HPFGUIDX 42831

Is cross-gendered Polyjuicing possible? (I hope I wrote that right.)

Say a man named Theo makes Polyjuice potion from the hair of a girl 
he knows at work, Erin. So Theo appears to be Erin. Jude, Erin's 
boyfriend, meanders along and sees Erin!Theo and doesn't realize that 
he's seeing Theo in disguise. Jude is feeling a little randy...

Is copulation possible? This is assuming Theo was willing to keep up 
the charade (for curiosity's sake, of course). Is pregnancy possible? 
According to the Harry Potter lexicon, Theo would only LOOK like 
Erin. So I'm thinking no. 

Say Theo made a polyjuice potion using one of Jude's fingernails, and 
copulated with Erin, who was completely unaware of her lover's true 
identity. And say she got pregnant. Would she be carrying Jude's 
child, or Theo's child?

Sorry if this has been discussed, or if it seems a wee bit odd, but 
it's been one of those days.

K.