1. prostate is found about the first knuckle up the anus. At the most, no more than the middle joint of the finger. Baby, you learn how to massage that little gland and your man will be putty; his eyes will glaze over and he'll purrr.
2. the tip suggestion is fine, just remember to run your tongue from the top of the tip to the base of the dick on the underside of the shaft. Very sensitive area there. and a light touch of the tongue is all that is needed; tease that area.
{we'll talk about ice cube techniques once we are all happy with the current hints } no need in sensory overload...