yes you may be at risk. having same sex anal intercourse without a condom puts you at risk if your partner has hiv. unless you saw his negative test results and knew the test results of all of his past partners (and yours) then you only have his word. hiv can enter the body through micro-tears in the genital and anal area; ejaculation is not relevant. you will need to be tested re-tested and re-tested again.
what is my risk of contracting hiv? . i was the top partner during anal sex with another man. i used a condom for the first half and then for about 3 minutes did not use one before i decided it wasnt working out and stopped. neither one of us ejaculated. i am wondering if any risk of hiv was posed to me. . as a side note my partner said he was negative but i have no proof.