I'm an attractive girl and I purposely enroll in male professors classes because I know I'll receive better grades
Do you really think that professors give better grades to female students?
They definitely give better grades to female students who are attractive. I'm definitely aiming to receive better grades.
I can hear what you're saying, but it's wrong to use your looks to manipulate others for personal benefits. People will think that you think you are better than them since you don't need to work as hard for good grades. You should take classes because they are interesting, not because they are easy to get good grades in.
It's normal to use your looks to get better grades.
It may be normal, but it doesn't make it right nor moral for you to use it as a means to have better grades, as you are only hurting yourself in the process. Even if you have good grades, it would not have prepared you for the real world if you are looking for a job and finds out you really were not prepared at all.