What is the reproductive behavior of pigs, including details about their mating rituals and the unique physiological aspect of pigs orgasms?

Pigs are known for their promiscuous mating behavior, with both males and females engaging in multiple partners. During mating rituals, male pigs will often compete for the attention of a female by displaying aggressive behaviors. Female pigs are known to be receptive to mating only during specific periods of their reproductive cycle.

One unique aspect of pig reproduction is the presence of a "post-copulatory lock." This is a physiological response where the male's penis swells inside the female's reproductive tract, preventing other males from mating with her for a period of time. This lock is believed to increase the chances of successful fertilization.