Check recent news reports about sex.com's lawsuit against Network Solutions. It's never been done successfully, and sex.com's case will probably set the legal precedent. The main reason against suing is it will probably cost well over $100K in legal fees and several years work to successfully try it, and success is far from guaranteed.
A couple articles:
http://thewhir.com/marketwatch/sex072202.cfm
http://thewhir.com/marketwatch/sex022403.cfm