I will explain - will give up the place not beautiful, but old or pregnant

Humor at this resource! Or stop, do you really believe it? Well googled experiments then if you don’t see what’s going on. Beautiful, and also in a challenging dress / makeup will give up / carry a bag / other times more often than pregnant or old.
During my pregnancy only women gave me a seat. According to my colleagues, I am not alone.
But when I was 18 years old, I didn’t have an offer to sit in the tram, yes.