It depends on many variables. The zombie will need to have been an attractive woman before tragedy struck her, we'd have to be alone since safety is very important in a zombie apocalypse and also for the fact that it's a pretty shameful act (desperate times call for desperate measures however), and I'd for sure need a condom to prevent receiving STDS (this was an attractive woman in her previous life), receiving potential fatal diseases zombies carry on them, and to prevent possible human-zombie pregnancy (wouldn't want human-zombie mutants running around). People who say they wouldn't do this are obviously in denial and haven't experienced the sexual loneliness they will for sure experience in a zombie apocalypse.