I’m in third place (black) but I think we can do better.
Black scales are very very pretty, but this is D&D dragons specifically, where they have an active hatred of all living things except for specifically themselves, and humans need a hazmat suit to safely pet, let alone fuck, them.
The metallics are at least more physically safe, though golds are too proud to let anyone fuck them and silvers are too much of humanaboos to fuck in dragon form. A copper would be fun, if you have a good sense of humor about it.
EVIL DRAGONS FUCK BETTER SCIENTIFIC FACT DIE DIE DIE DIE
Greens are the most fuckable, but they will fuck off and leave any resulting offspring with the other parent .