That Bruss rarely grow up with their birth parents or relatives has left them with an interesting instinctual quirk: they're innately wired to find individuals who appear dissimilar to themselves attractive. The function of this is to prevent accidental inbreeding, but it has the added upshot of causing the vast majority of Bruss to be extremely DTF with other alien species. The fact that they're also very frequently prone to travel far away from their home planet, often as hauliers or drivers - space truckers, essentially - has given the Bruss a not entirely inaccurate reputation.
Don't worry, it'll go in with a enough lube and enough persistence. π