Under Canadian law today, I believe a good many men and women have committed sexual assault, usually of a minor degree of course.. (I don't say that to normalize it, but to make people aware of their own actions and words.)

Here's my understanding. If, out of a sexual motive, you apply (or threaten to apply) physical force of any sort to someone without their consent, you are liable to a charge of sexual assault. For example, a patron in a bar might be sexually attracted to someone they don't know, and grab his/her bum on the dance floor. That's sexual assault, although the typical consequence is to be ejected from the bar rather than charges being laid. So yes, I believe that it is routine for people to speak of committing sexual assault, although they would probably deny that what they did or were contemplating was an offence.

As for more serious forms of sexual assault, no- I've never heard someone talk of committing it.