When cheetahs bond together, they do for life. Cheetah partners spend about 93% of their time together and male same-sex partners are quite common.
The two bonded males will groom one another (usually a sign of partnered straight cheetahs), defend each other in fights and get anxiety if separated. Once reunited the male cheetahs will face-rub one another, mount one another (fully erect) and stutter (a sexual excitement vocalisation).
It is estimated that 27-40% of wild male cheetahs live with same-sex partners and that 16-19% of wild male cheetahs life in a same-sex trio.