If sex enters then friendship between man and woman is not real or true! Nonsense. What's the need to use sex as a criterion to determine whether friendship is real or not? If one says the issue relates more with friendship and not sex then what's the need to bothered over what others perceive about quality of friendship? I mean why one is so bothered about the type of friendship that exists between man and woman? The whole world is guided by some sorts of interests. Is that too easy to be Nishkam (selfless? In Ramcharit Manas, it's clearly stated right from Devas (Demigods) to human beings all are guided by some interests.
I fail to understand what's the need to view man-woman friendship from a special angle? Are same sex relationships above interests? I have altogether a different take on this issue. Let's not use the presence or absence of sex as the determining factor to measure the worth of man and woman relationship. No problem if sex is there. If it's not there then treat that too as normal! In my eyes ice always melts in presence of fire. It's natural. Why so much fuss? The only worrying factor is that the whole relationship should not get limited to sexual gestures alone. In other words, the relationship was a flawed one if it was merely preserved for sexual favours.
If that's not the case then just enjoy the relationship singing Kishore's hit number from Amar Prem: Kuch To Log Kahenge Logo Ka Kaam Hai Kehna!