Boars who want to mate mark trees with their urine. They also produce foamy saliva by champing. Champing involves gnashing teeth and chewing resulting in saliva that contains the male sex hormone pheromone androstenol. The urine and saliva notify the females of his intention to mate.
Pigs enjoy touching each other and make nuzzling a part of their courtship. During courtship, the boar may nudge and nuzzle the sow's flank, head, genital area and shoulders, showering her with his attention. The sow and boar sing to each other as they nuzzle and chase each other. He may begin to push her to see if she is ready to stand.
When the boar has successfully wooed the sow who is in heat, she will stand still and allow him to mount her. He will jump up and place his front legs on her back. He may need to scoot sideways to get directly behind her into mating position. His front legs hold on to the sow just in front of her hips once he is in position.
Boars can take up to 30 minutes to ejaculate. During this time, the boar remains mounted on the sow occasionally thrusting. She may graze and take occasional steps forward until he is finished and slides or jumps off.