How do gay men decide who is what....

I watched Brokeback Mountain some time back during my movie marathon. What really bothered me about that movie wasn't actually only its gay scenes. In actual fact, when I watched the gay scenes, I wondered....

"On his first time in bed, how would a gay man know if he is a fucker (the one that contributes the wood) or a fuckee (the one that painfully takes it up his ass)?"

I pondered for a while until I came up with 3 possible explanations.

Explanation 1: Batang Size

The one with the bigger/longer kotek would naturally be the "fucker" right...?
Assuming that a bigger kotek gives you more pleasure...

Explanation 2: Lubang Density

Similar to Explanation 1, the one with the tighter lubang (butt hole) should obviously be the "fuckee" right? (Again, assuming that the tighter the lubang the more pleasure it brings).




Explanation 3: King of the Jungle

In the jungle, the strong will kill the weak. Similarly, in our world... the strong will fuck the weak. So in this case...

Fucker
and Fuckee

And there you have it. The best 3 explanations at least I could come up with. If you have any ideas of your own, do leave your comments. If you don't... do check out this video from the very talked about Brokeback Mountain.