I don't think they create body waste, so they don't have to get rid of it.
But I've wondered about the impregnation thing, too. AH-HA! Just got it. Remember, that the reason female vampiers can't have babies is that the body needs to change to accomodate the growth of te fetus.
Well, if the body has to change and GROW, then a male vampire couldn't get an erection, no? Or he always has an erection? I've looked at the male vampires zones and there ain't no hardiication in the zonal region.
I still don't see how the seminal fluid and sperm get created, with the limitations of their bodies in that regard.
Another question----if vampires can transmit their "venom" to a human, is it held and dispersed like a viper does it? Because vampires don't have blood per se in their veins. So if they can transmit venom that way, can they also transmit any diseases they have?
Because if a vampire drinks a human's blood and the human has hepatitis or whatever, would the vampire get it? Or would they be a vector (not getting it themselves, but transmitting it to others)?
Many, many questions....