From this article in the Times, a list of 20 weird court cases, come the following sex-related ones ~ nearly half of them!
2. In 2005, a Brazilian woman sued her partner for failing to give her orgasms. The 31-year old woman from Jundiai asserted in her case that her 38-year old partner routinely ended sexual intercourse after he reached an orgasm. After a promising start the action ended in something of an anticlimax for the claimant when her case was rejected.
5. In 2005, the Massachusetts Appeals Court was asked to rule on when a sexual technique was dangerous. Early one morning, a man and woman in a long-term relationship were engaged in consensual intercourse. During the passionate event, and, without the man’s consent, the woman suddenly manoeuvred herself in a way that caused him to suffer a penile fracture. Emergency surgery was required. The court ruled that while “reckless” sexual conduct may be actionable, “merely negligent” conduct was not. It dismissed the man’s case.