From the US CDC
Can Hepatitis B be spread through sex?
Yes. Among adults in the United States, Hepatitis B is most commonly spread through sexual contact and accounts for nearly two-thirds of acute Hepatitis B cases. In fact, Hepatitis B is 50–100 times more infectious than HIV and can be passed through the exchange of body fluids, such as semen, vaginal fluids, and blood.
How is Hepatitis B spread?
Hepatitis B is spread when blood, semen, or other body fluid infected with the Hepatitis B virus enters the body of a person who is not infected. People can become infected with the virus during activities such as:
Birth (spread from an infected mother to her baby during birth)
Sex with an infected partner
Sharing needles, syringes, or other drug-injection equipment
Sharing items such as razors or toothbrushes with an infected person
Direct contact with the blood or open sores of an infected person
Exposure to blood from needlesticks or other sharp instruments
This is the hepatitis social community I am not familiar with Hep B virus try your question in the Hepatitis B community Forum. They will know more there.
http://www.medhelp.org/forums/Hepatitis-B/show/223