Right whales too - with a metric tonne of balls to bring to the party - they are made for lovin' not fightin':

Right whales form large mating aggregations, which can include several males seeking access to a female. However, unlike humpback whale competitive groups, male right whales do not engage in aggressive displays. One female may successively mate with several males, and it is believed that males compete to pass their genes to the next generation through quantity of sperm they deliver when they mate, rather than fighting for access to females. This theory is supported by the fact that male right whales have the largest testes of any animal on earth (up to 500 kg each), as well as extremely large penises.

https://iwc.int/about-whales/whale-species/right-whale