I would echo the sentiments of your other respondents that there may very well be too much of a moral conflict between being a teacher, role model for her students, and being a nude model, not what parents want as a role model for their kids. However, since this is college, and not high school, you might be able to do it with the Dean's permission. The thought of being your own model in your own art class is intriguing but I can't imagine the uncomfortable atmosphere in the class room when you are trying to teach them instead of being their model and having the students gawking at you instead of listening to you.
I would think that you could teach in the day and model at another school in the evening. That won't leave much time for your family.
Your choice. I would vote for teaching and quit the modeling.