Yes. I have heard of sexual favours being provided by a trainee to get into a (highly sought after) Dermatology training program. Another way to put it is that

Yes. I have heard of sexual favours being provided by a trainee to get into a (highly sought after) Dermatology training program. Another way to put it is that anyone who can be exploited will be exploited. The differences are only in frequency and visiblity.