look you guys gotta understand that women's orgasm is a bit different. We can have amazing sex and not orgasm and it's ok. A woman can orgasm without even touching herself, that's how "in the head" we are. Its good either way. If you really want to make her cum try oral.
I've had a penis since birth and I can still have amazing sex without orgasming. For me it's more a matter of habit. When I started having sex, I wanted to orgasm every time. As I got more experienced, I started enjoying all the other stuff in sex more, and I regularly have sex with my partner without orgasming - most of my orgasms now come from masturbation.
Because men sometimes take it personally when they "can't make you cum." Occasionally they get mad and blame you. It's safer to just hide it and figure it out later if necessary.
I've done it successfully. Well, at least I wasn't questioned. It happened when I was too drunk to "finish" back when I was an even worse drunk than I am now. She seemed to have a good time as well so I consider it a win either way.
This is the key. Go down on her. Do it for as long as it takes. Listen to her and her body. Make sure she gets hers. Give her what she needs. A whole lot of sins can be forgiven if you can give good cunnilingus and make sure she's taken care of.
Sure, sounds good in the short term. Probably better in the long term to be honest and figure out something that lets everyone to have an orgasm though.
This assumes that the person faking it expects continued interaction and/or safety. Women often fake it with flings when they simply want things to finish and don’t want to have an awkward conversation with the person they never intend to see again. They also fake it to avoid confrontation due to perceived emasculation.
Now, if you feel safe in your non-transient relationship, this is literally the best advice in the world.