What bugs me about this group is that we are supposed to believe they managed to survive for some time before MC came along.
Sorry, but if this dimwits had previous experience in fighting zombies, why did they instantly collapse like that? Like there was no reason for the girl to push the guy. She could have just run away. And why was she unwilling to have sex all of a sudden? Having sex is the only reason the guys are with her in the first place. She should be used to having sex in dangerous situations like this one.
Author really killed them off for the sake of killing them off.