Has the behaviour to be repeated or persistent for it to be sexual harassment?
It depends on the severity of the behaviour. If one single incident can reasonably be considered to create a negative psychological and emotional environment for work or study, then there is no need for repetition for the behaviour to constitute sexual harassment. Examples would be a sexual assault or losing a tangible benefit after refusing a sexual request. Generally, comments of a sexual nature would have to occur repeatedly for the behaviour to be considered sexual harassment.
