You are not the lone ranger. I remember a time in college I sat down with a female friend in the student union. I just wanted a cup of coffee. She was studying for her chemistry final. She looked at me and said "I need sex." Whoa. I had absolutely no idea what to do with that. She was attractive and a nice person and I liked her a lot, but I just couldn't handle casual sex when it was offered to me on a silver platter.