For example... Lets say a household member is sick. You don't want to get sick so you avoid that individual. Same applies for snakes.
Theoretically you can house them together, but if one gets ill (RI) or carries infestation (mites, ticks, etc...) then you run the risk if the other getting it too. Better be safe than sorry.
-Chris
1.0.0 Albino Red Blood Python (Maximus)
1.1.5 Crested Gecko
1.1.0 G pulchripes
0.0.1 A geniculata
0.0.1 A versicolor
0.1.0 G rosea
1.0 90% Black Lab/ 10% Pitbull (Ryder)
1.0 Cocker Spaniel (Rocky)