@tai: Sorry about the mistake about writing your name. I edited it.
You're right, the survival of the fittest. But the weaker member of the specie can get a chance. And the one of the weakest members that would use that chance would become the fitter (not the fittest) and would be able to preserve his gene pool. So it's again the same thing, but on another level. This would be a sort of a safety mechanism.
Imagine:
8 lions.
5 females
3 males
The strongest male gets the females by chasing the other two males away. 4 females get impregnated - there's still one left. The fitter of the other two would get the chance.
Being sexually active does make you sexually fitter. So if one of those two males would be inactive and the other would "masturbate" - being active, that would make him the fitter one. So the fitter one could have offspring. And because it's the case with many animals that the strongest one chases the rest away and has more females to himself - the sexual activity wothout the female seems a necesary thing. So in that case homosexuality (or rather bi-sexuality) would actually increase the chances for that animal.
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