I often climax giving a BJ. It is empowering to be in total control of the outcum. It is mentally stimulating and usually my nipples are brushing against his body or the sheets adding to the effect. It is a form of good tension that builds and finally comes to a head, pardon the pun, when he explodes in my mouth. That often carries me over the edge. Of course, I swallow what I put so much effort into creating. BTW, giving head while being fucked is not that easy.