I consider using people any time you're dishonest about your intention or lie your way through to try obtain anything from that unsuspecting person.
This has already happened twice with 2 different male friends I've known for years. It was clear there wasn't anything romantic between us ever. One of tried groping me and then excusing it with an ''Oh sorry, I was just teasing'' when I removed his hands from him. Another ended up admitting in the end that he was trying to get a date from me eventually and though I would naturally changed my mind.
The groper ended up ghosting me afterwards and the other one blocked me. Needless to say I felt used. If I wanted a relationship I would make it clear from day 1, not pretend to be someone's friend and do the ''go by the natural flaw, maybe the person will change their minds eventually'' method; sound like deceiving to me.
Isn't that still using people?