White men date black women but not all black women want to date white men and not all white men want to date black women, some because of personal prejudices, others because of the prejudices of their family and friends. Some white guys abstain, fearing it would come over as mere "curiosity dating." Personally, If I didn't date a black girl it was because when i was 'dating around' there were really few black girls in my city and in college (in HS there wasn't any black girl)
Most non-White females agree, often even openly, that White women are the most physical attractive women on the planet. Especially blonde, blue-eyed women. Why then should any White man date a non-White woman, Black or otherwise?