It's a drive. A biologicaly need. In not so recent past, many people (mainly men) risked death (becaues being gay was illegal) just to be able to have sex (and in many places that is probably still true).

So it's unrealistic for you to just dismiss it as "unhealthy obsession".

Edit: life would obviously be much easier and better if we were perfectly natural and had complete control over our instincts. But we're not (well most of us) and we have to deal with it somehow. Maybe sex robots or VR :)