Depending on the guidelines and politics of your studio, you may not want to discuss your attraction with your boss or fellow teachers. If you teach at a corporate location, an employee handbook may specify that you be disciplined for bringing up sexual or romantic feelings towards students. Don’t let these circumstances inspire negative feelings. Humans are wired to find each other attractive, and even the best yoga teachers are still human.
Yoga is all about the mind and body connection. It is about being in tune with your breath and your posture, so the issue of ethics and liability is often far from many yoga instructors' minds. That is not to say these teachers are unethical, only that this indicates their passion for yoga. The fact is their students often take precedent over potential ethical and legal concerns.