obscene

猥褻(わいせつ)	Gross, obscene. Always bad. A morbidly obese exhibitionist with genital warts. NP

卑猥(ひわい)	Nasty, dirty, obscene. Not always used in a bad way. Usually used by older men.

エロイなぁ～	A casual, conversational word for nasty or obscene