Hmmm, I remember posting something on IMDB that suggested that both of the twins were males by comparing the size ratio of their hands to that of 7's. Unlike 7's - the only female in the group that has small, delicate-looking hands - both 3 and 4's are much larger and similar in size and design to those of the other males in the group. But their skin seems to be made out of the same material as 7's, so I could be wrong...
I think they are twin sisters, mostly because of the blue thing going on (7's blue-ish?).
I don't agree on that - 7 doesn't look blue at all, she looks white, and if I've seen any color on her at all, it's rust-red stains.
Also, what 12 said about the hands.
I would much much MUCH rather they both be male. I've noticed that often when people are designing characters and twins are involved, the twins are always made female and are sexy little things. It would be refreshing from a character design standpoint to see a set of twins that are male.
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