the question good or bad idea to me is not relevant because that has to be up to the individuals themselves..first off if you have been friends with this person for years, when you first met them did you find them attractive? but some how you thought it best to remain friends? If that is the case, then there was something about that person that made you think that they were not dating material in the first place and you don't want to make more out of it just because your lonely or desperate. And you also have to take in account that men think differently than women..a man can have a sexual relationship with a woman and keep it moving with no feelings involved but with women nine times out of ten they will catch feelings, so you first have to ask yourself is it worth going after in the first place and if our frienship becomes a relationship and it does not work out will i lose a good friend in the process before you approach the subject with the other person? You must be honest, communication is key and remeber that one sided opinions is never effective communication also commuicating is not a debate, listen and understand the other person's side whether you agree or not. If you are not 100% sure that if the relationship side does not work out and you might lose the friendship side then be prepared to lose that person all the way around.