Why don't women get into the passenger seat in front though it's vacant?

I am a male working in infopark. In the past few months I have been using my car to commute to work. I used to offer carpools on quick ride app also to people waiting at the smart City to phase 2 (I work at phase 2)

The strange thing I have observed is that women don't board the co passenger seat in front. I acknowledge that men can be creepy but I have experienced this kind of treatment from people in my own office.

I don't know whether its a big thing or not but I have felt this to be uncomfortable being treated like this. But I would like to here what women has to say about this and from men as well who have come accross similar situations.