friendship

I saw a movie called "when Harry met Sally" in my oral class. It is a lovey movie. The first they know each other is on their way to New tork. After they chatting for a while, both of them know they are totally different type of person. Harry doesn't think men and women can be friend if the women is attractive. Men usually want to have sex with women. However, Sally considers that men and women can be friend. Talking about the friendship between men and women, I agree with Sally. Is that ture the men only think about having sex with a woman? I have many boy friends they probably don't want have sex with me. It is mean that i am not attractive?