Animals that have only one mate in their lifetime are relatively few, and dolphins do not have only one partner in their lifetime. While mating is chaotic, it is possible that several males will simply snatch females from other groups and try to prevent them from escaping. In addition, there may also be many dolphins gathered together to tease each other, which may be more chaotic. In addition, one species of dolphin may mate with another species of dolphin.
In fact, the dolphin is a kind of relatively lustful animal, so some people call the dolphin "Teddy in the sea.". Dolphins may harass not only many members of the opposite sex, but also young dolphins, other species of dolphins, and even other species. Obviously, it is impossible to say that dolphins have only one partner in their life.
As mentioned above, dolphins do not have only one partner for life. Institutionally, they are not monogamous. There is indeed a certain social nature within dolphins, which is also reflected in marital relations, but it is not like monogamy, but more like polyandry. Dolphins are more like matriarchal clans, with one female in a group and multiple males at the same time. However, it can also be chaotic when mating, such as the above-mentioned groups coming together to tease each other, or dolphins harassing other species, etc., are all possible phenomena.