Centaur

The counterpart to a unicorn is a centaur, sometimes known as a pegasus. They are usually a bisexual or heteroflexible masculine person who enjoys sexual play with male and/or female partners in non-monogamous or polyamorous relationships or with those who enjoy swinging and/or group sex.

They are different from a bull, who is generally a straight man who enjoys cuckolding. They are named after a mythical creature as they are considered to be rare.