Hello As you mentioned that there was anal intercourse and presumed that your partner was positive HIV ( as you mentioned in the query ). Now read this carefully : There is a strong association of transmission of HIV with receptive anal intercourse , probably only a thin ,fragile , rectal mucous membrane separates the deposited semen from potentially susceptible cells in and beneath the mucosa and trauma may be associated with anal intercourse. Anal douching & sexual practices that traumatized the rectal mucosa also increase the likelihood of infection. I do agree with you that there was not blood or or bruise but anal intercourse is most dangerous way of transmission of HIV . Now you have to wait for 2 weeks till antibodies begin to appear for HIV . Else ,you can start anti viral treatment in advance after consultation with a physician . After two weeks you can get rapid P 24 nucleic acid amplification test ( pcr , rna ). But it is not necessary that person always get HIV (even if partner is positive ) so don t take any tension and wait for 2 weeks of initial infection. Good luck.