Should I try to give my wife multiple orgasms? She says it’s not necessary but I wonder if she is just being nice about it and secretly desires them?

Only if she asks for them!

She says [multiple orgasms are] not necessary …

Please, please, please listen to your wife on this. Often, the sexual partners of women (often men) learn a “technique” that the women they’ve been sexual with like or that they hear other women like … and then attempt to apply that technique to all women in general (or the women they’re currently sexual with in particular).

If there’s one thing that should be taught and repeated … then taught and repeated again for good measure, it’s this: women are individuals and are as uniquely different as any other individual. If you’re a cisgender dude, would you like your wife twisting your junk into a pretzel without warning because she heard somewhere that “men” like that sort of thing?

If you sense someone’s merely being polite about your technique, first stop having sex and then ask for their honest feedback about what they’d really like. Maybe cut the proceedings short this time and come back to it when you’re both amenable.

Don’t try to give someone an orgasm (let alone multiple orgasms) they don’t really want. Don’t try to prove something to yourself at the expense of someone else’s body. Honor consent in every circumstance.