why so many women want to have sex with me because I am foreign?

I am from Mexico and I came to Finland to study in the University. My friend told me this is a forum that is popular with women.

Why so many women hate and talk shit about Finnish men? When I came here many girls want to have sex with me only because I am foreign. They are crazy. In my country only putas sleep with this many men, but they do it for money.

Also, many of my Finnish friends never present me to their friends. Why is that? To me this is not normal. In my country a group of people go out and do things together.