My girlfriend has very little sensation in her labia, and she gets pretty much zero from me fingering her (she says it actually takes away from the experience) so I do alot of licking and sucking of her clit. She likes it when I kind of suck her lips and clit together in my mouth while tonguing them, but it takes a while, and I too begin to get numb in the lips. I get that feeling afterwords sometimes where my lips have been kind of squished by the sucking? I kind of make the motion that a toothless man would make when eating?
I was just complaining because she litterally cannot go for more than 5 minutes, even if shes constantly interrupting the actual BJ to just tongue me or kiss parts of it. She doesn't take me deep enough to gag herself, so I don't think thats really the issue. Its also not her complaining about her lips getting numb. I'd be satisfied if she could go 15-20 minutes!
The reason I said something about stamina is because what she does complain about is her jaw... opening up your jaw requires you to keep a muscle flexed... which is basically oral stamina. Maybe later on the lips would go numb, but she doesn't have the stamina or will or whatever to go that long. *shrug*
BTW: I don't think she has a yeast infection, because sometimes shes perfectly fine, the pain is usually the next day or 2 days after when we try to have sex again. I can't remember the last time we had sex more than once in a day
I basically get the response that 1 time a day should be "enough"