did she told you that he felt it in his head? like real good for both of them? if yes then its the same experience I had... since it gets to a different place, I could do this by placing my self and moving her ( in a few strokes I could find it, also there is more dificulty if there is not lube... :) her on top aand missionary... some weird positions I do whiles on top with my hips and hand on her butt.