well i have an interesting comment on all of this. . . my husband and i have been together for nearly 20 years. for years and years if i was giving him a bj, he would tap on my arm or try to pull me away when he was about to cum. i had never said anything to him before giving him a bj for the first time, but i think that he just felt it was impolite or whatever to cum in my mouth. so he would pull me away, and i would oblige, moving onto his nipples or something and he would cum after i moved away. he still taps on me to pull me away, but now i DO NOT oblige. . . i will keep going until he DOES cum in my mouth.