Cowboy came in second for favorite sex position among respondents who identified as bisexual in onesurveyof U.K. and U.S. respondents conducted byDrEd.com.
In the article“First time going raw with a fuckbud -- a masculine 25 year old straight guy,”throwaway__987123 says, “[Cowboy] position probably makes the most sense for someone whose primary prostate play comes from a dildo -- he's used to using a device to fuck himself so it makes sense for his ass to feel good when he can fuck himself on my dick.”
In the cow[boy] position, the [giver] lies on his back or sits, with the [receiving partner] straddling him across his pelvis facing forward, either in a kneeling or squatting position.
A cowboy is an animal herder who tends cattle on ranches in North America, traditionally on horseback, and often performs a multitude of other ranch-related tasks.
A sexual position where the [receiving partner] goes on top of the [giver] when he's lying down.One of the deepest penetrations of sexual positions...Gives you a nice view of [the receiver's pecs] and hits [his manhole] effectively every time [he] goes down.Can also...slap [his] ass to force [him] to ride faster.
In the cow[boy] position, the [giver] lies on his back or sits, with the [receiving partner] straddling him across his pelvis facing forward, either in a kneeling or squatting position. 
A cowboy is an animal herder who tends cattle on ranches in North America, traditionally on horseback, and often performs a multitude of other ranch-related tasks.