What defines indecent assault legally?

Indecent assault is legally defined by the absence of consent combined with the act being of an indecent nature. The correct choice captures this definition accurately, emphasizing that the act involves both the element of indecency and the crucial lack of consent from the victim. This concept is fundamental in distinguishing indecent assault from other forms of physical interaction, as the legality hinges on the victim's consent and the nature of the act itself. While other options touch upon related aspects, they do not encompass both elements of indecency and the critical lack of consent that characterizes indecent assault as defined by law.