Sexual activity would be any activity that involves such contact and fulfills the desires of the agent. This genital contact may involve another person contacting them in different ways, such as orally, manually, anal or vaginal. However, this contact does not require another person's body to be considered a sexual act, which is why I have chosen to exclude this aspect of the definition. I did it because this pleasure could be obtained through contact with one's own genitals and using specific tools, whether anyone else was present or not. Someone might desire genital contact with another person, but engage in that contact themselves while fulfilling the person's desire.