Dear Alice,

Make sure that you're addressing the taste factor, too. If deep penetration isn't the issue, taste could be. Be sure to wash your genital area thoroughly and to rinse well in the shower. (Make sure she knows to do the same, too. It goes both ways.) Having her brush her teeth/use mouthwash/chew gum immediately beforehand is a good way to make things go more smoothly, too. If the issue is solely the penetration, then she could try numbing her mouth to make it less sensitive to all of the movement involved in fellatio. I'm a fan of sucking on ice before going down on my boyfriend. Not only does it make my mouth less sensitive, but he also LOVES the way the combination of the cold ice and the warm mouth feels. If ice isn't your thing, you could try an oral anesthetic such as Chloraseptic spray to take care of the numbing (even though I'm not a fan of the taste of that stuff.) Hope this helps!