Nevada forbids sex between students and school staff who are at least age 21. It makes no difference if the students are at the age of consent. There is always a power imbalance. The sexual conduct that NRS 201.540-.550 forbids includes: Penetrative sex (scroll up to section 2 for a full definition), oral-genital contact, contact with unclothed genitals or pubic area to arouse or gratify the sexual desire of either person, sadomasochistic abuse, lewd exhibition of unclothed genitals, or any lewd or lascivious act upon the body. Student-teacher sex is a category C felony in Nevada. The punishment includes: One to five (1 - 5) years in prison, and possibly up to $10,000 in fines, and sex offender status. Statutory rape or lewdness charges would apply if the student is under 16.