Are These Guys Lovers or Ex Lovers? [PHOTO]

For the first two minutes after i saw this picture, i laughed till i began to feel pain in my chest. Well, now that i'm a bit calm (still giggling), I would love to ask:

Does anyone know the kind of relationship the men in this picture share?

Are they lovers, ex lovers or just something else that is yet to cross my mind? If you have a answers, don't hesitate to share.

Note: I hope you noticed the way the guy leaning on the car grabbed the slimmer guy's ass? LOL