Well, using a word usually mean that you have a cursory knowledge of its meaning. But they didn't exactly elaborate on what they meant by saying that sex doesn't implcitly mean consent.
The only way i could justify that position, is of they meant sex(*noun), and the description of organisms that create gametes of different size and shapes.
Sexual relations, coitus, boinking or one of the many different versions of describing the various acts of genital relationships between humans, DOES imply consent. Otherwise it is sexual misconduct or rape.
But i recon both of you already know this.