I know that biting isn´t something you do on a first date, some people might never do it at all. But for some people biting is something special. Some people might think that it´s a bad thing but actually in a relationship it´s not, at least under normal circumstances. If someone attacks you then biting might be a bad thing, still that doesn´t mean that you can´t enjoy it....
Biting can be a mystery to some people, because it´s not always easy for some people to do it. The fear of a negative reaction is sometimes scary, which is understandable because not everyone does it or likes it. The last thing you want is to send a wrong message to the one you want to be with, especially when you´re in the middle of playing with eachother. So how do you know when to bite and when not to bite? I´d say that the best way to find out is just to try it, of course that doesn´t mean that you bite very hard. Just a little nibble at first and maybe you can increase the number of nibbles over time and also bite a little bit harder. Your partner will pick this up, maybe some people are a bit reluctant what to say about it but in a way that´s also an answer. If you bite someone else and the other completely ignores it, then it´s safe to say that he or she isn´t into that. He or she might let you bite him or her, but I don´t think it´s an invitation to do it all the time. Unlike some things I don´t think you need to have a whole conversation with your partner if you can bite him or her, because sometimes it´s nice to be spontanious. If you discuss everything you´re going to do before you do it, then what´s the point of doing it?
Is a bite a way of teasing or an invitation for sex? That would really depend, because if you´re just fooling around then it can just be a way of teasing. Just remember that if you bite someone that is really into biting that a bite can turn into much more than just teasing. I´ve had some experience with that myself when a girl was very turned on if I bit her, which meant diving on top of me and some rough sex. Which is a good thing, don´t get me wrong, but if you´re not into sex then be careful if you decide to bite someone. You don´t want to be in a spot where you have to turn someone down when you started something, it´s lame for you and for the other! But I doubt it´s a bit problem, I think most couples know what the other likes and also what they need to do to turn the other on. I don´t think everyone will take advantage of that or at least you would expect someone not to do that. Once again it really depends what type of person you are and what type of relationship you have.
Biting means vampire stuff, right? No not at all, it can just be a way of expressing yourself. But it´s true that some people who identifiy themself as a vampire will most likely introduce biting into their love life. So anyone who isn´t into biting might want to keep that in mind, but it doesn´t mean that everyone that is into vampires likes biting. Just remember two things. Don´t bite to hard when you bite someone for the first time, even when they say that you can you don´t want to mess it up. Also don´t bite so hard that you actually make someone bleed, some people might be into that but I´d say you have a big chance that your partner isn´t into that. Keep it safe and keep it simple, that´s a good way to introduce biting into your play time.