It is not so easy . First , you need to know how to swim or at least float on water. You dick must be rock hard. Full co-operation of your partner will be needed. The action cannot be too strong or you cannot keep your dick in continuous action. She will be like a teddy bear around you . But it will be best for beginner to have one lean on a rock or in a swim pool against the wall. After you get the rhymn and skill you can try in the middle of the water with both head above the water. Personally , I don't like it . Once in a while will be fine and not all the time. But I like the feeling of two nude body holding each other tight . The feeling of seeing and be seen by others is very tempting .