You're failing to get it here. Also, you're once again incorrectly referring to same sex sexual behavior as somehow reproductive.<quoted text>
But if your claim is correct that homosexual sex evolved for that reason, the other baboon would be a heterosexual one.
So my question remains: As a heterosexual, how would a baboon's dick up my ass relieve tension?
I can't speak from experience, but I am inclined to predict that such dick up my ass would CAUSE tension.
In turn, it would cause tension for the other baboon, as he experienced the various sensations of his head being ripped from his body.
I also fail to see how any of that fulfills the evolutionary purpose, as announced by Dawkins, of my genes to propagate themselves to the next generation.
In summary, the facts compel me to conclude you and those you cite are making shit up.
Clearly you don't really care about understanding why same sex sexual behavior evolved. If you did, you wouldn't make up such a stupid scenario and then pretend you've accomplished something.