If you are friends with a girl and you want to ask her out, well, dont.
We are all entitled to our opinion, and I just want to say I do not entirely agree with this. Asking a friend out will change your relationship, but that is not always a bad thing. Many good serious relationships start with friendships. I personally believe that one cannot have a good long lasting relationship without the element of friendship existing. It is a gamble as she may not be interested in dating you, but don't just avoid asking her out just because you are friends. You could be missing out on something even better!!