Ok, sit back and take a moment.
When I make love to my wife she'll orgasm, just once... from my body grinding on her clit not really from penetration. She'll have more and "better" orgasms from me giving her oral. Her g-spot isn't that deep but it's not stimulated by me making love to her, but if I stimulate it with my finger while giving her oral then it's "even better".
Someone mentioned an "a spot", I'm not sure if that's it, but my wife says there is a spot "very deep" that larger cock then me and average guys can reach, along with greater pressure on the g-spot (ie. longer and thicker) which gives her more intense orgasms and gives her multiple orgasms as long as they keep going. She says that those are the best and longest lasting orgasms and she knows she's not going to be able to prevent having them over and over.
I know that she'll "self love" with a very large toy that will trigger that "a-spot" multiple intense orgasm, but it's not as good as "the real thing".
Also, she has the implant, multi year birth control and doesn't have monthly periods, but 4 or 5 days a month she'll really crave that deep "a-spot" simulation.