Yes and yes, I believe guys can be friends with an attractive woman(women) and vice versa... I mean pple can't help if there attractive or not or if he/she wants to be friends with that other person.NOW! if he or she wants to use a friendship to get into the other persons underwear than we have a problem buddy.
regardless of appearance, I think it is very difficult for a man and woman to just be friends. this is because one of them will always be attracted to the other. Everyone under 18 will say its possible, but I am in my 20's and in my experience friendships are not possible unless they are gay.