Some experts believe that the prostate gland is the male equivalent of the G Spot, giving intense pleasure when stimulated. Try inserting a clean finger into his anus, and pressing in the direction of his belly button. A couple of centimetres up, you should find a nodule about the size of a small nut, which is his prostate.

Well done, you have finished the test. You now know just as much, if not more than your partner about his body! Look out for the second part, on erections and ejaculation.