For your post of searching a young lady to be your Chinese teacher, what I can say is...it's really a sensitive topic. So don't be upset if you, both you and your friend, see something you don't like, . People, people. We can't expect people talking and thinking in the way we want or like.
If I were you I would say something like this: I am a Argentiean guy and currently looking for a Chinese girl to teach me Chinese and help me understand more about Chinese culture. For exchange, I will teach your Spanish. Since I also want our relationship to be leaded to marriage, I prefer a single girl........
Making your purpose clearly and directly sometimes is very good for talking sensitive topics.
Good Luck!
If I were you I would say something like this: I am a Argentiean guy and currently looking for a Chinese girl to teach me Chinese and help me understand more about Chinese culture. For exchange, I will teach your Spanish. Since I also want our relationship to be leaded to marriage, I prefer a single girl........
Making your purpose clearly and directly sometimes is very good for talking sensitive topics.
Good Luck!