Once upon a time I would have said yes men and women can just be mates but now I know that if there is any hint of sexual attraction things can get awkward (I'm *not* gonna say "messy")
I've had female friends in the past and where there has been a sexual attraction on my part I've gotten over it and tried to be just mates. But I have messed up in the past, really messed up and the worst thing about it is losing a friend.