Answer No. 1 -.Putting finger in vagina and then licking , can cause the STD and AIDS, Because the vaginal fluids contains the infections, whether they are of STD or Hiv . The bacteria, and viruses , live freely in vaginal fluid. The male will not be safe , However therehas been no research on percentage of getting the infection.
Answer 2.If the female has inserted the finger in vagina, the infection has been transmited to fingers through vaginal fluid. If male dont touches fingers , then he can lick her breasts . he will not catch the infection. The point lies in the fact , she should not touch her infected fingers to her breasts.
#1 - There is high risk of catching the infection which includes STD and HIV infection.
#2-There is medium risk.
I again repeat , it is not safe to have this method, avoid this.