There have been long-term studies of couples where one is positive and one is negative. In the couples who used condoms for anal or vaginal intercourse, but no barrier for oral activities, not one of the negative partners became infected with hiv. Not one.
并且,通过长期的对一方感染另一方未感染的夫妻经行的研究发现,这些夫妻只在刚交和性jiao时使用安全套,而口J行为是完全无保护的,但这个研究到目前都没有发现未感染的一方被传染。