among other factors such as a high percent of black women being ho's, crack ho's and welfare sows with nigletts from multiple bucks, is the high percent of jigs spending time in prison/jail.
plus, you have the 'down low' culture of jigs. If a white guy likes guys, he's gay. If he likes girls, but occasionaly does it with guys, he's bi. But when a nigger engages in bi-sexual behavior, they say he's just 'on the down low'
it's just an extension of the nig's philosophy of non-responsibility. you can have goods and services without working, you can have kids without responsibility, and you can get queer with another guy without being bi or gay. on the off chance a sow cared enough to ask if the nig is bi or gay, he can answer no without thinking twice - he's not bi or gay, he's just 'on the down low' (not that he would have any trouble lying, but sows might be able to tell when a nig is actually telling the truth for once)
they can fool themselves and other nigs, but they cant fool viruses.
"A genius has perhaps scarcely ever appeared amongst the negroes, and the standard of their morality is almost universally so low that it is beginning to be acknowledged in America that their emancipation was an act of imprudence." -Otto Weininger, Sex and Character