People aren't subject to natural functions in the same way that animals are. We have more control over our reproductive systems, so homosexuals can perform exapted, civilized functions, circumventing the natural limits which in their case are mixed up.

You don't think technological advances are potentially progressive for society? Just read some science fiction to get an idea of the possibilities for realistic human godhood.

The fact that life will likely hit a dead in the very long run doesn't negate the progress that would have happened beforehand.