Can hep b/c transmit between 2 men having anal sex & both men r uninfected with hep b/c? That is can anal sex between uninfected person cause hep b/c?

No. If every one in the group having anal sex is truly not infected at that time, no one would get hep b/c. The problem arises that if they were tested 4 weeks ago or a week ago & had sex after that with some one + then you are at risk no matter what the test showed. Also condoms are not 100% protection.
No. If neither man has infection or carrier state of neither virus than neither hepatitis b nor c can be transmitted. Note that both viruses usually infect as an asymptomatic carrier state and unless tested, a person would not know they're infected. Always use a latex condom.

Related Questions

An hep b/c transmit between 2 men having anal sex & both men r uninfected with hep b/c? That is can anal sex between uninfected person cause hep b/c?

Hepatitis. Hepatitis b and c are viruses that are transmitted from an infected person to an unifected person. They do not "come out of nowhere". However, it can be difficult to determine when a person became infected, as it is often asymptomatic for long periods of time before detection. Read more...