According to Section 2 of the Sex Discrimination Ordinance*, sexual harassment covers the sexual harassment of both men and women as well as persons of the same sex.
Sexual harassment may involve uninvited and unwelcome physical, visual, verbal, or non-verbal conduct of a sexual nature that makes the person being sexually harassed feel offended, humiliated, or intimidated, or which creates a hostile or intimidating environment.
One single incident can constitute sexual harassment. It is not necessary for there to be a series of incidents.
*Section 2(5) of the Sex Discrimination Ordinance defines sexual harassment while sections 2(7), 2(8), 9, 23, and 39 are all relevant.
*Examples are taken from the Equal Opportunities Common Website.