IMO no. Not code sequence type mutations. That’s would require over a short time, significant and targeted behaviour change over a generation or two with consistent mutation in a directed manner and that’s not possible.
Most of it is culturally pushed - most of us have a behavioural immune system response to things we find harmful or disgusting and homosexual behaviour in males triggers that response. Much of the current cultural milieu is aimed at conditioning that response out of us to be able to breach our boundaries and control and use us. That is the biological difference between the progressives and the more conservative. The progressives have lost that protective ‘yuck’ response.
Whether there’s an inbuilt epigenetic mechanism to reduce population when at high densities is unknown, but I would suspect it’s more psychological- high density living drives humans insane and into a state where they don’t breed and start killing their own.