[@budiprasetya]

@budiprasetya asked the Naked Scientists:
   
Is homosexuality limited to humans? Are there any records in pre-historic humans?

What do you think?

[Bored chemist]

"Is homosexuality limited to humans?"
No, it's fairly common among other animals.

"Are there any records in pre-historic humans?"
I doubt it because it's not the sort of thing that leaves fossils.
You might find some gay porn painted on a stone age wall somewhere.

[RD]

You must have missed Ricky Gervais's show entitled "Animals"  [] ...
 

(vulgar comedy, not for the easily offended)

[CliffordK]

Humans are relatively unique that they have interests in sexual intercourse at times other than ovulation, although I suppose I've seen male dogs get excited at odd moments.  But, in most species, the males can sense when a receptive female is nearby.

It is possible that monogamous homosexuality is more prevalent in humans than other species.

However, if you have a herd of cows (all female) you will see them jumping onto each other when one comes into heat.