Unnecessary to invoke the "laws of nature", common sense will suffice.
Strand 1000 male homosexuals on a paradisiacal South Sea island, complete with all the requirements to sustain comfortable life, and a gay minister to perform marriage ceremonies.
Come back in 100 years.
Uninhabited island.
Your experiment is flawed. If you put 1000 male heterosexuals on an island you'd get exactly the same outcome. Probably a similar amount of bumming will have happened as well.