What are the levels/stages of LOVE b/w a boy & a girl?

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Actually, I'm a bit confused that... Is it important that you should KISS & have s*x with the boy/girl you love... is it a special stage of relationship on which people do this kind of stuff...?!?! If U think it should happen then give reasons... I personally think that this shouldn't happen in any case... I don't find it necessary... but may be you can change my mind... can U...? lets C...:D:D:D