I haven't ever faked if they aren't getting me there I let them know. I would rather tell the truth and work through it to show them what works for me and what doesn't then to lead them on thinking they are amazing in bed when they aren't
I never really understood the point of faking one. The reasoning of not wanting to hurt your partners feelings isn't even a valid one in my mind. Unless the G Spot is stimulated I can not cum from vaginal penetration alone I always let my partners know that and as long as I enjoyed the sex I also let them know that.
I don't lie about orgasm, but I will sound a little more enthused than I am to speed him along.
Now that I am a lesbian, I find that I do not have to do this as often as I did when I was having sex with a man. But motivating them with good sounds was as close as I came to faking it. I enjoy my orgasm too much to be a quitter for myself.
I don't think I ever have but my sister has admitted she has, but she has good reason because apparently her boyfriend gets really turned on when she orgasms so he gets more into it meaning sometimes the only way for her to actually orgasm is to pretend she already did.
I have faked it. Reason (simple): To get him off. Reason (complex): I was in a marriage with an emotionally abusive man. So for obvious reasons the thought of him even touching me turned me off. The only way to get him off was for me to fake it. Otherwise I would be ridiculed for not getting him off. It was pure self preservation.
Other than that, I have never faked it. I've never needed to fake it.
I used to fake orgasms when I was younger. Part of it, for me, was just not having enough self-respect or agency to realize that my experience mattered. I only faked when the sex wasn't fun for me, which was pretty often because I didn't feel like I was allowed to give any constructive criticism or ask for what I wanted (I'd read too many novels with male protagonists in which sex was a thing he does to her, and she's either good and yielding or she's nothing; and she certainly never has opinions or preferences). It genuinely didn't occur to me until I was maybe 24 that I was a person, and one half of the people involved, and was allowed to want things and even sometimes maybe to get what I wanted. So my goal in sex was to get him off, and when sex was boring or uncomfortable, I wanted that to happen faster. Faking enthusiasm and faking orgasm made it over sooner.
I think faking orgasms is a phenomenon born of two things. 1) cultural attitudes toward sex that obscure or repress women's sexual agency, and 2) lack of communication about sex between the partners.