A 22-year-old man with three male sex partners in the past 6 months presents to the emergency department with symptoms of acute hepatitis and is confirmed to have hepatitis A virus (HAV) infection. He does not drink alcohol and has no previous history of liver disease. He acknowledges having condomless anal and oral sex with his sex partners. Which one of the following is most likely to result in sexual transmission of HAV among men who have sex with men when one of the partners has HAV infection? Sharing of saliva during kissing Contact with semen during receptive condomless sex when the insertive partner has acute HAV Blood exposure during anal intercourse (with a partner who has chronic HAV infection) Oral-anal sexual contact with a partner who has acute HAV infection