Sex in a swimming pool and in the sea is both relaxing and stimulating because physically demanding positions are made so much easier by the buoyancy. For example, with the man standing a woman can easily be supported with her hips around his waist and her arms around his neck. Penetration is deep and their upper bodies are in close contact. Care has to be taken to ensure that not too much water enters the vagina but once the penis is inside, both partners experience extra sensitivity and stimulation. It can be a very enjoyable way to pass an hour or so in the sun.