Of course she is a girl

Today I had a very nice brunch with my friends. It was great to see these friends after a long time. Of course they wanted to hear everything about my Dutch girl. They were very happy for me and us. They said that I glow because I am so happy! After brunch we went to an interior design shop. There was a nice poster, which presented a map of The Netherlands. I decided to buy the poster to hang it on my wall. The salesman asked if I have some connection to The Netherlands. I told that my partner lives there.
He told me that he knows many couples from which the woman is from Finland and the man is Dutch. Then we talked about how the Finnish and Dutch people are. We have same kind of humor and we appreciate the same things and values. We chatted for a while and then he asked if my Dutch man is two meters tall. I was confused and I only answered… Yes. My friends laughed at me. Of course my partner is a girl! It was a really strange situation. I thought that the salesman understood that I have a girlfriend instead of a boyfriend. But where would he have understood that from? In the Finnish language, there is no difference about the word 'she' or 'he'. Nobody can understand from your words if she/he is a girl or boy. That is quite nice, usually...