Once again, you throw out “facts” with no references. What evolutionary biologists? Who are they? What are their credentials? Where were the studies conducted and when?
The very fact that homosexual acts cannot result in procreation substantiates my original statement. You provide wishful thinking, not research.
It is a safe position the user you reply to holds. Across nature species are in fact strengthened by their non-reproducing elements, not weakened by them. Species from ants and wasps in the insect world to many examples such as the bald mole rat in the mammal world benefit greatly rather than suffer from the existence of non-reproducing elements in their hierarchy.
Such beneficial non-reproduction is achieved in a variety of ways from the simple one of making those elements sex less and so removing the element of reproduction from them, but in others it can be achieved by re-directing the sexual impulse to non-reproductive ends (such as homosexuality) while still retaining the beneficial aspects of the act (such as social commitment and bonding).
In other words in these animals, humans included, it is not the homosexual act itself that is beneficial, but the elements of the species that are created by the redirection of their instincts by the homosexual act into non-reproductive pathways.
Successful reproduction in evolution is not about having the most children only. It is about the successful and safe rearing of those children so they can have children of their own. If there are 2 sets of 4 siblings, the former having no homosexual elements and the latter having 1, then the children of the first group each have 100% parental care.
The children of the 3 non homosexuals in the second group also have 100% paternal care PLUS 33% of the homosexual care element of the 4th sibling. This gives a protective advantage as an example of what I referred to in paragraph 1 above. Not only that but given that a large number of the genes of the homosexual sibling are in the other siblings, not to mention their off spring, the successful transfer of ones genes into future generations does not require direct reproduction on ones own part.
As with all science a theory like that will be required to make predictions. If you wanted a sibling to be a protective but not reproducing element then you would certainly not want it to be the first born if you can help it. The prediction the theory would make therefore is that the younger the sibling the more effective it would be as a carer and protector for the children of its siblings. Is this born out in reality?
In fact it is as recent discoveries have shown that there appears a correlation between the number of children a woman has and the probability of that child being homosexual. A hormone thought to increase the probability of a son being homosexual, for example, is found to be present in greater quantities with each son a woman has, making the likely hood of each son in the sequence being the homosexual element.
This very concept is indeed explored by many evolutionary biologists. I would recommend the Selfish Gene by Richard Dawkins, not because I have any particular respect for him or that I think you can find good science in books, but because he does indeed cover this very topic clearly and concisely and his bibliography of the peer reviewed science he bases it on is detailed and will very effectively answer your request for names and publications.