Nah...I don't think so. Casual friends, sure. Exclusively best friends where they think its ok for only the two of them to hang out together on a daily basis, hell no! I don't like guys who has female best friends. Please don't give me the lame excuse "but..but we're just best friends!" when I catch the two of you sleeping together on the same bed. There should be some kind of limit to what you can do with your "best friend" and your girlfriend. Especially, if you already have a gf/bf, please don't go all touchy-feely with your opposite sex "best friend".