>Your assuming that all rats passing along the gay gene are themselves
I'm no expert in this field, but I suspect the language used here might be profoundly misleading. Does overcrowding produce dedicatedly homosexual rats, or just a marked increase in observed buggery? If the latter, this seems to me possibly due to enhanced territorial disputes, etc. Or do crowded male rats stop mounting female rats in heat? Do they *prefer* males? Is it only some (`gay') rats who prefer buggery all the time, or all rats some of the time? Anyone here know?