I am not aware of any scientific research that has been published in peer-reviewed journals that suggest any of these methods actually work to make semen or vaginal fluids taste sweeter or generally more pleasant. That said, I am also not aware of any research that discounts these methods – in other words, they are pretty much untested and unknown.
There’s something about the power of vibrating products that can make it easier for many women to orgasm. We don’t fully understand why vibrators are so effective at easing some women’s orgasms, but they can be.
Each woman’s vaginal scent and taste are unique to her. So, although it is common for vaginas to taste or smell a bit yeasty, acidic or like sour milk, a woman’s vaginal taste can change throughout her menstrual cycle or in response to her behaviors or her health.