>>520827370 (OP)
Because as a male your brain is wired to respond to sexual cues from females regardless of ethnicity (hips, butt and crotch shape, breasts, breast wobble, etc), and when aroused your executive functioning gets worse and your dopamine levels go up massively. This is an ancient animal instinct to ensure you are more likely to pass on your genes as much as possible. It's not logical and it can't discern mental or behavioural differences between races. Which is why sexual degeneracy is bad and needs to be kept in check, because your arousal will use dopamine to brainwash you into supporting racemixing, and it's downhill from there