Someone who loves being in water is often referred to as an "aquaphile" or "hydrophile." These terms describe individuals who have a strong affinity or love for water-related activities and environments. Aquaphiles may enjoy swimming, diving, snorkeling, surfing, or simply spending time in bodies of water like pools, lakes, rivers, or the ocean. It's worth noting that these terms are not clinical or medical diagnoses but rather informal descriptions of a person's preferences and interests.