A swinger is someone who engages in consensual sexual activities with people outside of their primary relationship, typically as part of a couple. Swinging often involves couples who agree to swap partners or engage in group sexual experiences with other couples or individuals. The practice is based on mutual consent and open communication between all parties involved.

Swingers engage in these activities for a variety of reasons, including exploring sexual fantasies, enhancing their relationship, or seeking novelty and excitement. Swinging is different from polyamory in that it tends to focus more on sexual encounters rather than emotional or romantic relationships with multiple partners.

Trust, honesty, and clear boundaries are essential in the swinger lifestyle to ensure that all partners are comfortable and on the same page regarding expectations and limits. Swinging can take place in private settings, at swinger parties, or in designated clubs or events designed for the swinger community.